US2814461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power operated slip mechanism
Assignee: Individual
•
Filing: 1951-09-28
•
Granted: 1957-11-26
•
Expires: 1971-09-28
Abstract
No abstract record available.
Inventors
- 👤 Martin Dulcie Ruth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:53
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1812721A
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US2231923A
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US2491711A
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US2545627A
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US2575356A
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US2641816A
Cited
US2575649A
Cited
US2629586A
Cited
US2636241A
Cited
US2564119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |