US3381567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof bolt
Assignee: TORQUE TENSION BOLT Co PR
•
Filing: 1966-05-09
•
Granted: 1968-05-07
•
Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Askey Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:02
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA692742A
Cited
FR374701A
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US1434394A
Cited
US1469667A
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US2120279A
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US2252316A
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US2625071A
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US2878709A
Cited
US3110212A
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DE1143772B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |