Patent US3611787A successfully refreshed from Google Patents.
US3611787A
Expired / Lapsed
US
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Apparatus for minimizing thermal gradient in test specimens
Assignee: Lockheed Martin Corp
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Filing: 1969-06-11
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Granted: 1971-10-12
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Expires: 1989-06-11
Abstract
Abstract APPARATUS FOR ELIMINATING OR MINIMIZING THE THERMAL GRADIENT WHICH OCCURS ACROSS A TEST SPECIMEN UNDERGOING A TENSILE TEST, ESPECIALLY AT NON-AMBIENT TEMPERATURES. TEST SPECIMEN BEING EVALUATED AT AN ELEVATED TEMPERATURE MAY UNDERGO A SIGNIFICANT AND UNDESIRED THERMAL GRADIENT THROUGHOUT A DIMENSION OF THE SPECIMEN, AND THIS THERMAL GRADIENT CAN INTRODUCE SUBNSTANTIAL INACCURACIES IN THE TEST DATA OBTAINED. A THERMAL GRADIENT MEASURED ALONG THE TEST SPECIMEN IS USED TO CONTROL THE ADDITION OF SUBTRACTION OF HEAT FROM THE SPECIMEN AS NECESSARY TO MINIMIZE THE UNWANTED THERMAL GRADIENT.
Inventors
- 👤 Anthony T D Annessa
- 👤 Harvard H Kranzlein Sr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:15
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N3/18
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |