Patent US2231829A successfully refreshed from Google Patents.
Patent US3351786A successfully refreshed from Google Patents.
US3351786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric-semiconductor, electromechanical transducer
Assignee: University of California Berkeley
•
Filing: 1965-08-06
•
Granted: 1967-11-07
•
Expires: 1985-08-06
Abstract
No abstract record available.
Inventors
- 👤 Richard S Muller
- 👤 Conragan James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:02
CPC Classifications
H; H10; H10D; H10D30/00; H10D30/60; H10D30/791; H10D30/798; G; G01; G01H; G01H11/00; G01H11/06; G01H11/08; H10D48/00; H10D48/50; H10D30/67; Y; Y10; Y10S; Y10S73/00; Y10S73/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A STRESS-STRAIN TRANSDUCER COMPRISING AN ACTIVE ELEMENT COMPOSED OF A BODY OF PIEZOELECTRIC MATERIAL HAVING CONDUCTIVE SOURCE AND DRAIN ELECTRODES AT OPPOSITE ENDS THEREOF, AN INSULATING COATING OVER SAID SOURCE AND DRAIN AND PIEZOELECTRIC BODY, AND A CONDUCTIVE GATE ELECTRODE MOUNTED ON SAID INSULATING COATING BETWEEN SAID SOURCE AND DRAIN, MEANS PROVIDING A GATE VOLTAGE TO SAID SOURCE AND GATE, MEANS PROVIDING A DRAIN VOLTAGE TO SAID SOURCE AND DRAIN, CURRENT INDICATING MEANS RESPONDING TO CURRENT FLOW BETWEEN SAID DRAIN AND SAID POWER SOURCE AND MEANS TO APPLY STRESS-STRAIN PRESSURE TO SAID ACTIVE ELEMENT WHEREBY THE CURRENT INDICATED BY SAID CURRENT INDICATING MEANS IS AN ANALOGUE OF THE QUANTUM OF STRESS-STRAIN APPLIED TO SAID ACTIVE ELEMENT.
Claim 2
Dependent Claim
116 words
A STRESS-STRAIN TRANSDUCER COMPRISING AN ACTIVE ELEMENT COMPOSED OF A BODY OF PIEZOELECTRIC MATERIAL HAVING CONDUCTIVE SOURCE AND DRAIN ELECTRODES AT OPPOSITE ENDS THEREOF, AN INSULATING COATING OVER SAID SOURCE AND DRAIN AND PIEZOELECTRIC BODY, AND A CONDUCTIVE GATE ELECTRODE MOUNTED ON SAID INSULATING COATING BETWEEN SAID SOURCE AND DRAIN, MEANS PROVIDING A GATE VOLTAGE TO SAID SOURCE AND GATE, MEANS PROVIDING A DRAIN VOLTAGE TO SAID SOURCE AND DRAIN, CURRENT INDICATING MEANS RESPONDING TO CURRENT FLOW BETWEEN SAID DRAIN AND SAID POWER SOURCE AND MEANS TO APPLY STRESS-STRAIN PRESSURE TO SAID ACTIVE ELEMENT WHEREBY THE CURRENT INDICATED BY SAID CURRENT INDICATING MEANS IS AN ANALOGUE OF THE QUANTUM OF STRESS-STRAIN APPLIED TO SAID ACTIVE ELEMENT.
References Cited (Backward Citations)
US3021441A
Cited
US3031591A
Cited
US3191061A
Cited
US3293512A
Cited
US3290569A
Cited
US3294988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |