US3313205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelastic stress indicating devices
Assignee: Individual
•
Filing: 1963-04-30
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Granted: 1967-04-11
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Expires: 1983-04-30
Abstract
No abstract record available.
Inventors
- 👤 Roberts Albert
- 👤 Hawkes Ivor
- 👤 Williams Frederick Trevor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/16; G01B11/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A STRESS INDICATING DEVICE FOR A STRUCTURE TO BE TESTED HAVING A HOLE THEREIN COMPRISING A LONGITUDINAL BLOCK OF BIREFRINGENT MATERIAL HAVING A TRANSVERSE CROSS-SECTION TO PROVIDE A CLOSE FIT WITH THE CROSS-SECTION OF THE HOLE IN THE STRUCTURE TO BE TESTED WHEN THE BLOCK IS INSERTED LENGTHWISE INTO THE HOLE ALONG THE LONGITUDINAL AXIS, A CIRCULARLY POLARIZING FILTER CEMENTED ALONG SAID AXIS TO ONE END OF THE BLOCK, A HOUSING SECURED ADJACENT THE OTHER SIDE OF THE FILTER FROM THAT OF THE BLOCK, THE HOUSING CONTAINING A HOLDER FOR A LIGHT SOURCE AND CONSTITUTING THE INNER END OF THE DEVICE TO BE INSERTED FIRST INTO THE HOLE IN THE STRUCTURE, A LIGHT SOURCE, AND LEADS FOR THE LIGHT SOURCE CARRIED THROUGH THE FILTER AND THE BLOCK TO THE END OF THE DEVICE REMOTE FROM THE HOUSING.
Claim 2
Dependent Claim
137 words
A STRESS INDICATING DEVICE FOR A STRUCTURE TO BE TESTED HAVING A HOLE THEREIN COMPRISING A LONGITUDINAL BLOCK OF BIREFRINGENT MATERIAL HAVING A TRANSVERSE CROSS-SECTION TO PROVIDE A CLOSE FIT WITH THE CROSS-SECTION OF THE HOLE IN THE STRUCTURE TO BE TESTED WHEN THE BLOCK IS INSERTED LENGTHWISE INTO THE HOLE ALONG THE LONGITUDINAL AXIS, A CIRCULARLY POLARIZING FILTER CEMENTED ALONG SAID AXIS TO ONE END OF THE BLOCK, A HOUSING SECURED ADJACENT THE OTHER SIDE OF THE FILTER FROM THAT OF THE BLOCK, THE HOUSING CONTAINING A HOLDER FOR A LIGHT SOURCE AND CONSTITUTING THE INNER END OF THE DEVICE TO BE INSERTED FIRST INTO THE HOLE IN THE STRUCTURE, A LIGHT SOURCE, AND LEADS FOR THE LIGHT SOURCE CARRIED THROUGH THE FILTER AND THE BLOCK TO THE END OF THE DEVICE REMOTE FROM THE HOUSING.
References Cited (Backward Citations)
US2415436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |