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US3372762A
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US
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Drilling apparatus locking assembly
Assignee: Youngstown Sheet and Tube Co
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Filing: 1965-04-26
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Granted: 1968-03-12
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Expires: 1985-04-26
Abstract
No abstract record available.
Inventors
- 👤 Roy H Cullen
- 👤 Charles H Elliott
- 👤 Jimmie R Aker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:56
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1307847A
Cited
US2355342A
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US2609182A
Cited
US2868507A
Cited
US2927806A
Cited
US3011844A
Cited
US3232638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |