US3538755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device and method for determining rock stress
Assignee: University of California Berkeley
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Filing: 1968-09-16
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Granted: 1970-11-10
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Expires: 1988-09-16
Abstract
No abstract record available.
Inventors
- 👤 Rodolfo V De La Cruz
- 👤 Richard E Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:01
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/16; E; E21; E21F; E21F17/00; E21F17/18; E21F17/185; G01N; G01N33/00; G01N33/24
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |