Patent US2435071A successfully refreshed from Google Patents.
US2943528A
Expired / Lapsed
US
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Mine roof stress indicating bolt
Assignee: Individual
•
Filing: 1957-10-29
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Granted: 1960-07-05
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Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 Virgil A Curry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:18
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/02; Y; Y10; Y10S; Y10S116/00; Y10S116/34; Y10S116/35; Y10S411/00; Y10S411/955; Y10S411/956; Y10S411/96
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR447143A
Cited
GB108937A
Cited
US1875930A
Cited
US1952600A
Cited
US1956745A
Cited
US2632355A
Cited
US2781687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |