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WO2000060374A1 - Dispositif portable distant passivement motorise - Google Patents

Dispositif portable distant passivement motorise Download PDF

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Publication number
WO2000060374A1
WO2000060374A1 PCT/US2000/008931 US0008931W WO0060374A1 WO 2000060374 A1 WO2000060374 A1 WO 2000060374A1 US 0008931 W US0008931 W US 0008931W WO 0060374 A1 WO0060374 A1 WO 0060374A1
Authority
WO
WIPO (PCT)
Prior art keywords
rfid
transmitter
beacon
far
transceiver
Prior art date
Application number
PCT/US2000/008931
Other languages
English (en)
Inventor
Charles R. Winston
Robert G. Morgan
Original Assignee
Otis Elevator Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otis Elevator Company filed Critical Otis Elevator Company
Publication of WO2000060374A1 publication Critical patent/WO2000060374A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00579—Power supply for the keyless data carrier
    • G07C2009/00587—Power supply for the keyless data carrier by battery
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00579—Power supply for the keyless data carrier
    • G07C2009/00603—Power supply for the keyless data carrier by power transmission from lock
    • G07C2009/00611—Power supply for the keyless data carrier by power transmission from lock by using inductive transmission
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves

Definitions

  • This invention relates to a portable remote device, such as may be used to call elevators for service, unlock automobiles, open doors, and the like, which utilizes a radio frequency identification device (RFID), to assure operability notwithstanding failure of its internal power source, and/or to reduce or avoid the use of batteries, thereby reducing damage to the ecological environment.
  • RFID radio frequency identification
  • a portable device carried by potential elevator passengers, which automatically enters a request for elevator service in response to a beacon prompt, from a beacon located ten or more meters from the elevator.
  • the beacon prompt includes a message portion identifying the beacon, whereby the portable device, when it transmits its request for service, can identify the beacon to which it is responding, thereby providing the elevator controller with information as to the floor to which service must be provided.
  • This allows the elevator controller to enter a call, which in that embodiment includes the destination of the passenger, so as to provide favorable assignments of elevators to answer the various calls.
  • a beacon close to the elevator will cause the portable device to again transmit, and identify the fact that it has been excited by a beacon near the elevator. This allows the controller to know that the passenger has reached the elevator, and has not changed his mind about using it. Similarly, when passengers enter the elevator car, the portable devices may again be interrogated and again identify the fact that they have been interrogated by a beacon within the elevator car itself. This allows the controller to cancel the destination stop for that passenger, if the passenger has not entered the elevator, as well as to perform other control functions.
  • Objects of the invention include provision of portable, remote control devices in which failure of the portable device power source will not result in a lockout, which do not waste power in a sleep mode, and which do not require batteries.
  • This invention is predicated on the fact that a radio frequency identification device (RFID) can operate with no power source, being powered totally by energy in received electromagnetic (RF) radiation.
  • RFID radio frequency identification device
  • a portable remote access device includes a RFID which is triggered to transmit a command message, such as a request for access or a panic alarm, in response to reception of electromagnetic radiation from a beacon, the portable device utilizing at least a portion of the received RFID electromagnetic radiation to provide the power to transmit the message; the RFID is combined with a more powerful transmitter, referred to herein as a "far transmitter", which provides early commands, such as an early placement of an elevator call while a passenger is ten or more meters from the elevator, or a command to open a garage door as a vehicle is traveling toward a garage, or to unlock a vehicle, which functions are at too great a range to be responsive to the RFID.
  • a command message such as a request for access or a panic alarm
  • the far transmitter portion of the portable device may be powered by a battery to provide early commands, when operating properly in response to the portable device's own source of power (such as a battery); when close enough, the RFID can register a call, unlock a vehicle or open a door, etc., in response to a beacon, even though the power source (battery) of the far transmitter has failed.
  • a far transmitter in a portable device may be set into a totally-off mode, to conserve battery or other power, and it may be awakened by the RFID portion of the device, after which it will transmit a command.
  • the far transmitter instead of a battery, the far transmitter may use a microgenerator, which is a device such used in upscale wristwatches to convert the kinetic energy in the motion of the wearer into stored electrical energy.
  • the far transmitter (and associated receiver, if desired) may be powered by energy received from a beacon such as a RFID beacon and stored within the portable device at various times when the device is near any beacon, and consumed at various other times whether the device is or is not near a beacon, thereby eliminating the need for batteries altogether.
  • a beacon such as a RFID beacon
  • the far transmitter (and receiver) may be powered by a conventional micro-generator, such as is currently used to power watches.
  • a conventional micro-generator such as is currently used to power watches.
  • Fig. 1 is a high level, functional block diagram of a first embodiment of a portable device according to the invention, partially powered by a battery and responsive to at least two beacons.
  • Fig. 2 is a high level, functional block diagram of a second embodiment of a portable device according to the invention, partially powered by a battery and responsive to activation of a switch and at least one beacon.
  • Fig. 3 is a high level, functional block diagram of a third embodiment of a portable device according to the invention, powered only by electromagnetic radiation received from an RFID beacon, and also responsive to at least one additional beacon.
  • Fig. 4 is a high level, functional block diagram of a fourth embodiment of a portable device according to the invention, powered only by electromagnetic radiation received from an RFID beacon, and responsive to actuation of a switch and at least said beacon.
  • Fig. 5 is a partial, perspective view of corridors of a building employing the invention to place an early call for elevator service from a distance.
  • FIG. 6 is a partial, perspective view of corridors of a building in which a remote device of the invention is utilized to either verify an earlier-placed call for elevator service, or to initiate a call for elevator service in the event that battery power has failed.
  • Fig. 7 is a perspective view of a home in which an embodiment of the invention is used to derive access.
  • Fig. 8 is a perspective view of a vehicle in which an embodiment of the invention is used to derive access or operate a panic alarm.
  • Fig. 9 is a high level, functional block diagram of a fifth embodiment of a portable device according to the invention, in which the RFID turns on the other circuits of the device.
  • Fig. 10 is a high level, functional block diagram of a sixth embodiment of a portable device according to the invention, partially powered by a micro-generator.
  • a portable remote access device includes a case 12 within which is disposed a RFID 13, which has a functional range of several meters, and a more powerful far transmitter 14 which has a range of several tens of meters.
  • the RFID 13 is conventional, having an antenna 17 connected to a transmitter 18, a receiver 19, and a power section 20.
  • the power section 20 extracts the power necessary to operate a microprocessor 21, the transmitter 18 and the receiver 19 directly from the electromagnetic radiation received at the antenna 17 from a RFID beacon.
  • the RFID 13 is conventional: upon receipt of a pulse of electromagnetic radiation, typically at a frequency of about 125 KHz, the receiver 19 activates a wake-up interrupt in the microprocessor 21 which formulates a coded return message for transmission by the transmitter 18, typically only identifying the particular RFID which has been interrogated; however, in this invention, the RFID transmission will typically include a command portion.
  • the far transmitter typically is SAW (surface acoustic wave) stabilized, operating at 315 MHz with a range of several tens of meters.
  • the transmitted message will typically include a command portion, such as to call an elevator to a given floor, open a door, etc.
  • the transmissions may be encrypted, such as in a manner set forth in U.S. Patents 5,363,448 and 5,377,270; however, in embodiments of the invention utilized to place unsecured elevator calls, encryption is not required.
  • the transmitter is part of a transceiver 24, which will typically have its own antenna 25 so as to maximize performance at the related frequency, and its own microprocessor.
  • the transceiver 24 is powered by a battery 26.
  • the embodiment of Fig. 1 may be utilized in a fashion illustrated with respect to Figs. 5 and 6. In Fig.
  • the portable remote access device 11 of the invention is being carried by a potential passenger 29 as he enters a building 30.
  • a bank of elevators 32 which may be on the order of 10 or 20 meters, an RF beacon 33 transmits an interrogation message at the frequency of the transceiver 24.
  • the message from the beacon 33 will include a beacon identification tag, as set forth in commonly owned, copending U.S. patent application Serial No. (OT-4387), filed
  • the beacon tag in the message from the beacon 33 is retransmitted, along with the identity of the passenger 29, by the transceiver 24 for receipt by a receiver 35.
  • the beacon tag allows the transceiver 24 to identify the beacon 33, and therefore the floor of the building on which the potential passenger 29 is located, so that the passenger's presence will not be related to any other floors of the building, notwithstanding the strength of transmission of the transceiver 24.
  • the receiver 35 provides the floor and passenger identification information to a dispatching controller so as to enter a request for elevator service, which may typically include the destination floor as well as the origin floor on which the passenger 29 is located.
  • a portable remote access device 1 lb in accordance with a second embodiment of the invention has a transmitter 24a in place of the transceiver 24 of Fig.
  • a beacon such as beacon 33 in Fig. 5
  • the embodiment of Fig. 2 may be used to call elevators in the same fashion as described with respect to Fig. 5, except that instead of being automatically operated by the beacon 33, the potential passenger 29 will press the switch 39 at some point, as he approaches an elevator from which service is desired.
  • the transmitter may be set into a totally off-state after each transmission, so as to conserve power, and the switch 39 may engage the power, wake up the transmitter and cause the transmission of a command.
  • the embodiment of Fig. 2 is also suited to open garage doors 40, 41 as shown in Fig. 7. Each door is operated in a conventional fashion by an operator 42, 43 which can receive the far signal from the transmitter 24a disposed within a device 1 lb in a vehicle 46.
  • an RFID beacon 47 will interrogate the RFID portion 13 of the device 1 lb, causing a response which will open either or both doors (as desired), thereby providing access even with a battery 26 which has failed.
  • the RFID beacon 47 may be arranged to transmit periodically only at certain times, such as when an alarm system within the house is armed as could be the case when nobody is in the house.
  • the device of Fig. 2 may be used to unlock vehicle doors and trunk lids, in a fashion similar to that described for garage doors, as shown in Fig. 8.
  • a vehicle system may employ a beacon 50 within the vehicle 51 , so that if the far transmitter 24a were inoperable in response to the switch 39 due to loss of battery or other power, a beacon may activate the RFID portion 13, and thereby provide access to the vehicle 51.
  • Figs. 3 and 4 which are identical to Figs. 1 and 2, respectively, except for the fact that no battery 26 is provided, and instead a line 26a is provided from the power section 20a of the RFID portion 13a of the device 1 lc, 1 Id.
  • the power section 20a is modified so as to store all energy in excess of that required to cause the RFID 13a to respond to a beacon, in capacitors, or in some other conventional fashion, and to not discharge the power capacitors, as typical RFIDs do following a transmission. This energy will be saved for use thereafter.
  • an RFID beacon similar to the beacon 37, located within each elevator car will provide charge to the unit during the tens of seconds that the passenger 29 is riding within the elevator car.
  • the devices may be charged by being left near a beacon in a garage, or in a vehicle, such as an RFID beacon that interrogates an ignition key (for security) which contains a remote device 11.
  • a device of the invention hanging on the same key ring can likely be charged by the RFID beacon associated with the ignition.
  • the device may itself be formed within a molded head of the ignition key itself, thereby requiring only a single unit be carried around to gain access to the vehicle, to operate the vehicle, to call an elevator, and to operate the garage doors.
  • This aspect of the invention totally eliminating the battery, eliminates dependence on batteries and reduces damage to the ecological environment as a consequence of waste battery disposal.
  • the transceiver or transmitter may share the microprocessor 21 of the RFID, instead of having one of its own, if desired.
  • FIG. 9 Another embodiment of the invention, shown in Fig. 9, is exactly the same as Fig. 2 except that the transmitter 24b need not be awakened by the switch 39, but is awakened by a signal on a line 55 from the microprocessor 21 of the RFID 13b, in response to a beacon signal received by the RFID. In this way, the transmitter 24b can be put into a totally-off mode so that no power is consumed from the battery 26.
  • a transmitting beacon such as beacon 33 in Fig.
  • the microprocessor 21 thereof will send a signal on the line 55 to awaken the transmitter 24b, so that it then starts to draw power from the battery 26, and either transmits a reply or waits for another beacon to alert it to transmit a reply.
  • the transmitter 24b need not have a switch 39, in any case, as desired.
  • the portable device 1 le is identical to that of Fig. 2 except that a microgenerator 26b provides power instead of a battery 26.
  • the microgenerator 26b is of a conventional type currently in use in upscale wristwatches.
  • the microgenerator will produce electricity, which, when aggregated in storage devices such as high quality capacitors, will provide sufficient power for the transmitter 24a to transmit a command.
  • the microgenerator 26b may be utilized in an embodiment similar to Fig. 1, in which a transceiver receives a beacon prompt before transmitting.
  • the microgenerator 26b may be used in an embodiment similar to Fig. 9 in which a signal on the line 55 from the microprocessor 21 will wake up the transmitter 24a, thereby avoiding power drain during a "sleep" mode.
  • the switch 39 may be eliminated unless it is needed for non-beacon applications (e.g., opening doors) which are provided in a combined device in addition to the beacon applications.
  • any of the features of any of the embodiments may be selectively combined to suit any particular utilization of the invention.
  • the invention has been described as being useful for gaining access to elevators, garages and vehicles; of course, the embodiment of Fig. 1 could be provided with a switch as in Fig. 2, and the embodiment of Fig. 3 could be provided a switch as in Fig. 4, so that either of these combined embodiments could be used for passive elevator calls and panic alarms, as well as switch-initiated access to vehicles, garages and other confined areas.
  • each message should have an encryption portion to provide security, and in order to enable placing an elevator call with a correct destination (if such is desired), each message should include an identity portion.
  • the invention has been shown as having the two portions of the device in a single case 12, such need not be the case in the embodiments of Figs. 1, 2 and 10, and in other embodiments where the far transmitter/transceiver is not dependent on the RFID.
  • the RFID may be embodied in a car key and the transmitter/transceiver may be embodied in a key fob on the same ring, or in an employee ID badge, or otherwise, with the RFID in a key or a key fob, or otherwise.
  • the description thus far utilizes simple commands and simple relationships between the RFID portion and the transmitter/transceiver portion.
  • the RFID may receive information for altering the messages or other parameters of operation of the transmitter/transceiver, and vice versa.
  • the manner of response of either portion may depend on data received from the other portion, either unsolicited or in response to a query. Either or both portions may be reprogrammable, in response to information received by either.
  • the radiation may be infrared, or any suitable wavelength.
  • the messages transmitted by the RFID and/or by the far transmitter may be simple authentication codes, or such codes coupled with any sort of command.
  • the energy storage device need not be part of the RFID portion, and it may store energy derived from electromagnetic radiation from transmitters that are not RFID beacons. Other switches may be added to control functions in both positions.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Selective Calling Equipment (AREA)
  • Lock And Its Accessories (AREA)

Abstract

L'invention concerne un dispositif portable distant (11) comprenant un émetteur d'appel lointain susceptible de faire partie d'un émetteur récepteur (24) répondant à une balise (33) ou d'être un émetteur (24a) répondant à un commutateur (39) ou les deux à la fois de manière à générer des avertisseurs individuels, des appels pour service d'ascenseur, une authentification, un accès à des véhicules, à des bâtiments, à des garages ou à d'autres lieux analogues. Le dispositif (11) comprend en outre une partie DIRF (13) qui, à proximité d'un ascenseur, d'un véhicule, d'un garage ou d'autres lieux analogues, répond à une balise (37) utilisant l'électricité acheminée par la balise de manière conventionnelle afin d'en assurer l'accès même si la batterie (26) d'un émetteur-récepteur (24) ou d'un émetteur (24a) est à plat. L'émetteur-récepteur (24) ou l'émetteur (24a) peut être alimenté par une unité d'énergie stockée (20a) de la partie DIRF (13) du dispositif (11) ou par un microgénérateur (26b), remplaçant ainsi la batterie. L'émetteur-récepteur ou l'émetteur lointain peut être automatiquement mis sous tension après utilisation et mis en route par le DIRF en réponse à une balise.
PCT/US2000/008931 1999-04-07 2000-04-04 Dispositif portable distant passivement motorise WO2000060374A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28780299A 1999-04-07 1999-04-07
US09/287,802 1999-04-07

Publications (1)

Publication Number Publication Date
WO2000060374A1 true WO2000060374A1 (fr) 2000-10-12

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002071328A1 (fr) * 2001-03-02 2002-09-12 Schlumberger Systemes Carte a puce avec alimentation en energie integree
EP1475754A1 (fr) * 2003-05-05 2004-11-10 Inventio Ag Système de contrôle de sécurité pour le transport de personnes avec un ascenseur et procédé d'utilisation de ce système
WO2006096409A2 (fr) 2005-03-04 2006-09-14 Wabtec Holding Corporation Capteur de commutation sans fil
SG137673A1 (en) * 2003-05-05 2007-12-28 Inventio Ag System for security checking or transport of persons by a lift installation and a method for operating this system
DE102007001314A1 (de) * 2007-01-02 2008-07-03 Georg Taubmann Takt- und Betriebsstundenzähleinrichtung
ES2343617A1 (es) * 2009-01-29 2010-08-04 Demac, S.A. Sistema automatico de apertura de puertas.
EP2238067B1 (fr) 2008-01-17 2015-05-20 Inventio AG Installation d'ascenseur, procédé de commande d'une telle installation d'ascenseur et procédé de rééquipement d'une installation d'ascenseur existante en une telle installation d'ascenseur
WO2017019383A1 (fr) * 2014-07-25 2017-02-02 General Electric Company Système matériel de pont sans fil permettant l'identification par radio-fréquence active (rfid) et de suivi de position
CN110294372A (zh) * 2018-03-23 2019-10-01 奥的斯电梯公司 一种无线信号装置、电梯服务请求系统和方法

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US4870419A (en) * 1980-02-13 1989-09-26 Eid Electronic Identification Systems, Ltd. Electronic identification system
US4973958A (en) * 1985-02-21 1990-11-27 Nissan Motor Company, Limited Keyless entry system for automotive devices antenna device allowing low power radio signal communication
US4988992A (en) * 1989-07-27 1991-01-29 The Chamberlain Group, Inc. System for establishing a code and controlling operation of equipment
US5517188A (en) * 1994-02-24 1996-05-14 Carroll; Gary T. Programmable identification apparatus and method therefor
US5920287A (en) * 1997-01-21 1999-07-06 Widata Corporation Radio location system for precisely tracking objects by RF transceiver tags which randomly and repetitively emit wideband identification signals

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870419A (en) * 1980-02-13 1989-09-26 Eid Electronic Identification Systems, Ltd. Electronic identification system
US4973958A (en) * 1985-02-21 1990-11-27 Nissan Motor Company, Limited Keyless entry system for automotive devices antenna device allowing low power radio signal communication
US4988992A (en) * 1989-07-27 1991-01-29 The Chamberlain Group, Inc. System for establishing a code and controlling operation of equipment
US5517188A (en) * 1994-02-24 1996-05-14 Carroll; Gary T. Programmable identification apparatus and method therefor
US5920287A (en) * 1997-01-21 1999-07-06 Widata Corporation Radio location system for precisely tracking objects by RF transceiver tags which randomly and repetitively emit wideband identification signals

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002071328A1 (fr) * 2001-03-02 2002-09-12 Schlumberger Systemes Carte a puce avec alimentation en energie integree
US7620817B2 (en) 2003-05-05 2009-11-17 Inventio Ag System for security checking or transport of persons by an elevator installation and a method for operating this system
SG137673A1 (en) * 2003-05-05 2007-12-28 Inventio Ag System for security checking or transport of persons by a lift installation and a method for operating this system
EP1475754A1 (fr) * 2003-05-05 2004-11-10 Inventio Ag Système de contrôle de sécurité pour le transport de personnes avec un ascenseur et procédé d'utilisation de ce système
WO2006096409A2 (fr) 2005-03-04 2006-09-14 Wabtec Holding Corporation Capteur de commutation sans fil
JP2008537035A (ja) * 2005-03-04 2008-09-11 ウォブテック・ホールディング・コーポレイション 無電力無線センサ
EP1855756A4 (fr) * 2005-03-04 2009-12-09 Wabtec Holding Corp Capteur de commutation sans fil
AU2006220924B2 (en) * 2005-03-04 2010-12-02 Wabtec Holding Corporation Wireless powerless switch sensor
DE102007001314A1 (de) * 2007-01-02 2008-07-03 Georg Taubmann Takt- und Betriebsstundenzähleinrichtung
EP2238067B2 (fr) † 2008-01-17 2018-09-12 Inventio AG Installation d'ascenseur, procédé de commande d'une telle installation d'ascenseur et procédé de rééquipement d'une installation d'ascenseur existante en une telle installation d'ascenseur
EP2238067B1 (fr) 2008-01-17 2015-05-20 Inventio AG Installation d'ascenseur, procédé de commande d'une telle installation d'ascenseur et procédé de rééquipement d'une installation d'ascenseur existante en une telle installation d'ascenseur
ES2343617A1 (es) * 2009-01-29 2010-08-04 Demac, S.A. Sistema automatico de apertura de puertas.
ES2343617B1 (es) * 2009-01-29 2011-06-16 Demac, S.A. Sistema automatico de apertura de puertas.
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