GB2079054B - Electret device - Google Patents

Electret device

Info

Publication number: GB2079054B
Authority: GB; United Kingdom
Prior art keywords: electret device; electret
Prior art date: 1980-06-30
Legal status (The legal status 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 status listed.): Expired

Application number

GB8119537A

Other versions

GB2079054A (en

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Toshiba Corp

Original Assignee

Tokyo Shibaura Electric Co Ltd

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.)

1980-06-30

Filing date

1981-06-24

Publication date

1984-02-22

1980-06-30 Priority claimed from JP8878180A external-priority patent/JPS5714287A/en

1980-06-30 Priority claimed from JP8882180A external-priority patent/JPS5714297A/en

1981-06-24 Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd

1982-01-13 Publication of GB2079054A publication Critical patent/GB2079054A/en

1984-02-22 Application granted granted Critical

1984-02-22 Publication of GB2079054B publication Critical patent/GB2079054B/en

Status Expired legal-status Critical Current

Links

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
- H01G7/02—Electrets, i.e. having a permanently-polarised dielectric

Landscapes

Engineering & Computer Science (AREA)
Power Engineering (AREA)
Microelectronics & Electronic Packaging (AREA)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

GB8119537A 1980-06-30 1981-06-24 Electret device Expired GB2079054B (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
JP8878180A JPS5714287A (en)	1980-06-30	1980-06-30	Electret device
JP8882180A JPS5714297A (en)	1980-06-30	1980-06-30	Electret device

Publications (2)

Publication Number	Publication Date
GB2079054A GB2079054A (en)	1982-01-13
GB2079054B true GB2079054B (en)	1984-02-22

Family

ID=26430121

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
GB8119537A Expired GB2079054B (en)	1980-06-30	1981-06-24	Electret device

Country Status (2)

Country	Link
DE (1)	DE3125777A1 (en)
GB (1)	GB2079054B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4443711A (en) *	1980-06-30	1984-04-17	Tokyo Shibaura Denki Kabushiki Kaisha	Electret device
JPS57188105A (en) *	1981-05-14	1982-11-19	Toshiba Corp	Electret constituent
FI115339B (en) *	2001-06-29	2005-04-15	Filtronic Lk Oy	Arrangement for integrating a radio telephone antenna head

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT282017B (en) *	1965-10-23	1970-06-10	Philip Morris Inc	Dielectric body
JPS4815868B1 (en) *	1969-08-28	1973-05-17
JPS4948119B1 (en) *	1969-12-19	1974-12-19
JPS5221364B2 (en) *	1971-11-04	1977-06-10
JPS5718641B2 (en) *	1973-07-17	1982-04-17
CA1025994A (en) *	1975-07-08	1978-02-07	Uniroyal Ltd.	Electromechanical transducer
DE2605809C2 (en) *	1976-02-12	1986-11-13	Minnesota Mining And Manufacturing Co., Saint Paul, Minn.	Sensor device for detecting a change in temperature or a change in bending stress
FR2386898A2 (en) *	1977-04-05	1978-11-03	Anvar	IMPROVEMENTS TO RELAY TYPE CONTROL DEVICES

1981
- 1981-06-24 GB GB8119537A patent/GB2079054B/en not_active Expired
- 1981-06-30 DE DE19813125777 patent/DE3125777A1/en not_active Ceased

Also Published As

Publication number	Publication date
GB2079054A (en)	1982-01-13
DE3125777A1 (en)	1982-05-27

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Legal Events

Date	Code	Title	Description
1987-02-18	PCNP	Patent ceased through non-payment of renewal fee