Patent US3563086A successfully refreshed from Google Patents.
US3563086A
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Fatigue testing machine
Assignee: LITTLETON RESEARCH AND ENGINEE
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Filing: 1968-10-15
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Granted: 1971-02-16
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Expires: 1988-10-15
Abstract
Abstract THE FATIGUE TESTING MACHINE OF THIS INVENTION COMPRISES OPPOSED, RE-ENTRANT STACKS OF PIEZOELECTRIC ELEMENTS, A PORTION OF THE STACK BEING FORMED FROM RINGS OR ANNULI OF PIEZOELECTRIC MATERIAL, AND EACH STACK HAVING AN INNER CORE PORTION FORMED OF PIEZOELECTRIC DISCS OR PLATES. THE SPECIMEN BEING TESTED IS HELD BY THE FREE ENDS OF THE INNER CORES. THE STACKS ARE DRIVEN IN OPPOSITE DIRECTIONS SIMULTANEOUSLY, THAT IS 180* OUT OF PHASE, TO GET THE DESIRED PULLING AND COMPRESSION ON THE TEST SPECIMEN. ONE OF THE STACKS IS MOUNTED ON A PLATFORM WHICH IS SUPPORTED ON A VISCOUSLY DAMPED PISTON TO COMPENSATE THE APPARATUS AGAINST THE EFFECTS OF STATIC LOADING ON THE SPECIMEN.
Inventors
- 👤 Flood Everett Reed Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:01
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N3/38; G01N2203/00; G01N2203/0014; G01N2203/0016; G01N2203/003; G01N2203/005; G01N2203/0051; G01N2203/0058; G01N2203/0069; G01N2203/0073
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |