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Patent US3978508A successfully refreshed from Google Patents.
US3978508A
Expired / Lapsed
US
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Pressure sensitive field effect device
Assignee: RCA Corp
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Filing: 1975-03-14
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Granted: 1976-08-31
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Expires: 1995-03-14
Abstract
Abstract A pressure sensitive field effect semiconductor device, which may be employed as a contactless switch is disclosed. The device employs at least one layer of an elastomer material which is also an electret to effectuate the conversion of a longitudinal pressure variation to an electrical variation and to create an electric field which regulates the conductivity of the current carrying channel.
Inventors
- 👤 David Herman Raphael Vilkomerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:29
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/692; H10P14/6921; H10P14/69215; G; G01; G01L; G01L9/00; G01L9/0098; H10D; H10D30/00; H10D30/60; H10D48/00; H10D48/50; H10D64/00; H10D64/60; H10D64/66; H10D64/68; H10D64/681; H10D64/685; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6306; H10P14/6308; H10P14/6309
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A pressure sensitive field effect device which is a part of a semiconductor integrated circuit which comprises: a first region and a second region in a body of semiconductor material, adjacent to a surface of said body and separated therein by a channel region, said channel region having a relatively thin insulating layer disposed thereover; resilient, compressible, electric field producing means disposed on said relatively thin insulating layer in continuous contact therewith, over said channel region, said resilient, compressible, electric field producing means being an elastomer which is also an electret; a counter electrode disposed over said channel region; and means providing a conductive path from said counter electrode to said body.
Claim 2
Dependent Claim
112 words
A pressure sensitive field effect device which is a part of a semiconductor integrated circuit which comprises: a first region and a second region in a body of semiconductor material, adjacent to a surface of said body and separated therein by a channel region, said channel region having a relatively thin insulating layer disposed thereover; resilient, compressible, electric field producing means disposed on said relatively thin insulating layer in continuous contact therewith, over said channel region, said resilient, compressible, electric field producing means being an elastomer which is also an electret; a counter electrode disposed over said channel region; and means providing a conductive path from said counter electrode to said body.
Claim 3
Dependent Claim
18 words
A pressure sensitive field effect device as claimed in claim 1 wherein: said insulating layer is silicon dioxide.
Claim 4
Dependent Claim
18 words
A pressure sensitive field effect device as claimed in claim 1 wherein: said electret is a homopolar electret.
Claim 5
Dependent Claim
18 words
A pressure sensitive field effect device as claimed in claim 1 wherein: said elastomer is a silicone rubber.
Claim 6
Dependent Claim
26 words
A pressure sensitive field effect device as claimed in claim 1 further comprising: a resilient compressible means disposed on said resilient compressible electric field producing means.
Claim 7
Dependent Claim
22 words
A pressure sensitive field effect device as claimed in claim 5 wherein: said resilient, compressible means is a layer of an elastomer.
Claim 8
Dependent Claim
27 words
A pressure sensitive field effect device as claimed in claim 5 wherein: said resilient compressible means is relatively thicker than said resilient, compressible electric field producing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |