US3178934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for photoelastic strain analysis of structural members
Assignee: AT&T Inc
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Filing: 1963-07-18
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Granted: 1965-04-20
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Expires: 1983-07-18
Abstract
No abstract record available.
Inventors
- 👤 O'regan Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:49
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/16; G01B11/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
AN ARTICLE OF MANUFACTURE FOR USE IN PHOTOELASTIC METHODS OF STRESS AND STRAIN ANALYSIS WHICH COMPRISES A MATRIX OR MAT FORMED OF A LARGE NUMBER OF LIKE, CLOSELY SPACE, ELONGATED STRIPS OF PHOTOELASTICALLY STRAIN-SENSITIVE MATERIAL ASSEMBLED IN PARALLEL RELATION AND SUPPORTED ON A LAYER OF A MATERIAL HAVING NEGLIGIBLE PHOTOELASTIC SENSITIVITY TO STRAIN, ADJACENT STRIPS BEING SUBSTANTIALLY MECHANICALLY INDEPENDENT OF EACH OTHER, THE WIDTH OF EACH STRIP IN THE PLANE OF THE SURFACE OF THE MATRIX OR MAT BEING A SMALL FRACTIONAL PART OF ITS LENGTH.
Claim 2
Dependent Claim
86 words
AN ARTICLE OF MANUFACTURE FOR USE IN PHOTOELASTIC METHODS OF STRESS AND STRAIN ANALYSIS WHICH COMPRISES A MATRIX OR MAT FORMED OF A LARGE NUMBER OF LIKE, CLOSELY SPACE, ELONGATED STRIPS OF PHOTOELASTICALLY STRAIN-SENSITIVE MATERIAL ASSEMBLED IN PARALLEL RELATION AND SUPPORTED ON A LAYER OF A MATERIAL HAVING NEGLIGIBLE PHOTOELASTIC SENSITIVITY TO STRAIN, ADJACENT STRIPS BEING SUBSTANTIALLY MECHANICALLY INDEPENDENT OF EACH OTHER, THE WIDTH OF EACH STRIP IN THE PLANE OF THE SURFACE OF THE MATRIX OR MAT BEING A SMALL FRACTIONAL PART OF ITS LENGTH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |