Patent US4427881A successfully refreshed from Google Patents.
US3067606A
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Photoelastic device for indicating principal strain directions
Assignee: Individual
•
Filing: 1959-12-01
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Granted: 1962-12-11
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Expires: 1979-12-01
Abstract
No abstract record available.
Inventors
- 👤 George U Oppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:16
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/16; G01B11/18; G01L; G01L1/00; G01L1/24; G01L1/241
Claims Analysis
Total Claims: 0
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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) | 1965-12-10 | 1966-06-11 | 1966-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-10 | 1970-06-11 | 1970-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-10 | 1974-06-11 | 1974-12-11 | $7700.00 | Window Closed / Lapsed |