US3572109A
Expired / Lapsed
US
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Integral semiconductor strain gage transducers with frequency output
Assignee: General Electric Co
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Filing: 1968-08-09
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Granted: 1971-03-23
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Expires: 1988-08-09
Abstract
Abstract A PRECISE INSTRUMENT TRANSDUCER HAVING AN ANALOG FREQUENCY OUTPUT AS A FUNCTION OF APPLIED FORCE COMPRISES TWO IDENTICAL WIEN BRIDGE OSCILLATORS WITH INTEGRAL SINGLE CRYSTAL SEMICONDUCTOR STRAIN GAGES ARRANGED TO PRODUCE APPROXIMATELY EQUAL AND OPPOSITE RESISTANCE CHANGES IN THE TWO OSCILLATORS SO THAT THE RESULTING FREQUENCY CHANGES ARE ADDITIVE. APPLIED AS AN ACCELEROMETER THE GAGE PAIRS ARE ON OPPOSITE SIDES OF A CANTILEVER BEAM, AND AS A LOAD CELL ARE ORIENTED IN DIFFERENT DIRECTIONS ON (100) CUT SILICON WHERE, TOGETHER WITH THE OTHER CIRCUIT ELEMENTS, THEY CAN BE FABRICATED BY INTEGRATED CIRCUIT TECHNIQUES.
Inventors
- 👤 Alexander J Yerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:39
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/12; G01P15/123; G01L; G01L1/00; G01L1/18; G01L1/20; G01L1/22; G01L1/225; G01L1/2262; H; H10; H10D; H10D99/00
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |