Patent US3137834A successfully refreshed from Google Patents.
US3137834A
Expired / Lapsed
US
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Piezoresistive stress gages
Assignee: AT&T Inc
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Filing: 1961-03-17
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Granted: 1964-06-16
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Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
- 👤 William G Pfann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:09
CPC Classifications
H; H10; H10D; H10D99/00; G; G01; G01B; G01B7/00; G01B7/16; G01H; G01H11/00; G01H11/06; G01L; G01L1/00; G01L1/18; G01L1/20; G01L1/22; G01L1/2287; G01L1/2293; H10D48/00; H10D48/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A SEMICONDUCTOR PIEZORESISTIVE STRESS GAGE WHICH COMPRISES TWO ACTIVE PIEZORESISTIVE SEMICONDUCTOR STRIPS HAVING EQUAL RESISTANCES WITHIN 10% DISPOSED NORMAL TO ONE ANOTHER AND MEANS INCLUDING ELECTRODE CONTACTS TO SAID STRIPS FOR MEASURING THE SUM OF HE PIEZORESISTIVE CHANGE IN BOH STRIPS, SAID TWO STRIPS HAVING WITH RESPECT TO ONE ANOTHER EQUAL LONGITUDINAL PIEZORESISTIVE COEFFICIENTS WITHIN 10%, EQUAL TRANSVERSE PIEZORESISTIVE COEFFICIENTS WITHIN 10%, AND EQUAL AND OPPOSITE-IN-SIGN LONGITUDINAL SHEAR COEFFICIENTS TO WITHIN 10%.
Claim 2
Dependent Claim
72 words
A SEMICONDUCTOR PIEZORESISTIVE STRESS GAGE WHICH COMPRISES TWO ACTIVE PIEZORESISTIVE SEMICONDUCTOR STRIPS HAVING EQUAL RESISTANCES WITHIN 10% DISPOSED NORMAL TO ONE ANOTHER AND MEANS INCLUDING ELECTRODE CONTACTS TO SAID STRIPS FOR MEASURING THE SUM OF HE PIEZORESISTIVE CHANGE IN BOH STRIPS, SAID TWO STRIPS HAVING WITH RESPECT TO ONE ANOTHER EQUAL LONGITUDINAL PIEZORESISTIVE COEFFICIENTS WITHIN 10%, EQUAL TRANSVERSE PIEZORESISTIVE COEFFICIENTS WITHIN 10%, AND EQUAL AND OPPOSITE-IN-SIGN LONGITUDINAL SHEAR COEFFICIENTS TO WITHIN 10%.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |