Patent US3705993A successfully refreshed from Google Patents.
US3705993A
Expired / Lapsed
US
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Piezoresistive transducers and devices with semiconducting films and their manufacturing process
Assignee: INST DE FIZICA
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Filing: 1971-07-14
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Granted: 1972-12-12
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Expires: 1991-07-14
Abstract
Abstract A METHOD OF MAKING A PIEZORESISTIVE DEVICE IN WHICH A MICA, SYNTHETIC RESIN OR METALLIC SUBSTRATE (THE LATTER COATED WITH A LAYER OF INSULATING ENAMEL) IS COATED WITH STRIPS OF COLLOIDAL-SILVER PASTE, IS FIRED TO FUSE THE RESULTING CONDUCTIVE STRIPS TO THE SUBSTRATE, IS PROVIDED WITH A LAYER OF VAPOR-DEOPSITIONG GERMANIUM BRIDGING THE STRIPS, IS FORMED WITH WIRE TERMINALS AND IS THEREAFTER COATED WITH A LACQUER.
Inventors
- 👤 Radu G Grigorovici
- 👤 Andrei Gavrila Devenyi
- 👤 Valer Florea
- 👤 Gheorghe Korony
- 👤 Carol Costachescu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:35
CPC Classifications
H; H04; H04R; H04R21/00; H04R21/02; G; G01; G01L; G01L1/00; G01L1/18; G01L1/20; G01L1/22; G01L1/2287; G01L1/2293; H01; H01C; H01C10/00; H01C10/10; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |