US2939683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power slip assembly
Assignee: Abegg and Reinhold Co
•
Filing: 1956-12-10
•
Granted: 1960-06-07
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Willy H Spiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:19
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23842E
Cited
US2231923A
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US2572318A
Cited
US2491711A
Cited
US2575649A
Cited
US2814461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |