Patent US2683891A successfully refreshed from Google Patents.
Patent US3614834A successfully refreshed from Google Patents.
US3614834A
Expired / Lapsed
US
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Extensometer for large diameter rods
Assignee: United States Department of the Air Force
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Filing: 1969-09-09
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Granted: 1971-10-26
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Expires: 1989-09-09
Abstract
Abstract AN EXTENSOMETER HAVING A PAIR OF HEAD MEMBERS WITH CIRCULAR OPENINGS THEREIN FOR RECEIVING REINFORCING BAR TEST SPECIMENS, EACH HAVING THREE SPRING-LOADED GAGE POINTS FOR MOUNTING THE HEAD MEMBERS ON THE TEST SPECIMEN. A LINEAR VARIABLE DIFFERENTIAL TRANSFORMER IS MOUNTED IN A HOUSING ON ONE OF THE HEAD MEMBERS AND PROVIDES AN OUTPUT SIGNAL. THE DIFFERENTIAL TRANSFORMER IS OPERATED BY A DISPLACEMENT SHAFT CONNECTED TO THE OTHER HEAD MEMBER THROUGH A 10:1 RATIO ARM.
Inventors
- 👤 Randolph E Holt
- 👤 Robert A Crist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:08
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/16; G01B7/24; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |