US3587301A
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Holographic interferometer for isopachic stress analysis
Assignee: United States Atomic Energy Commission
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Filing: 1968-12-19
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Granted: 1971-06-28
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Expires: 1988-12-19
Abstract
Abstract A HOLOGRAPHIC METHOD AND APPARATUS FO REAL-TIME ISOPACHIC (EQUAL OPTICAL PATH) STRES ANALYSIS OF SPECIMEN MATERIALS HAVING PHOTOELECTRIC STRESS-OPTIC PROPERTIES FOR STRUCTURAL ANALYSIS OF STRESSED STRUCTURES AND SHAPES. THE NOVEL HOLOGRAPHIC INTERFEROMETER PROVIDES A MEANS OF DETECTING AND MEASURING STRESS ZONES INSIDE A STRUCTURE OR SHAPE.
Inventors
- 👤 Henry H M Chau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:00
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/45; G01N21/453; G01B; G01B11/00; G01B11/16; G01B11/161; G01B11/164; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S359/902
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |