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US2772074A
Expired / Lapsed
US
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Power swivel
Assignee: Individual
•
Filing: 1952-12-09
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Granted: 1956-11-27
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Expires: 1972-12-09
Abstract
No abstract record available.
Inventors
- 👤 Stoffa Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:47
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; E21B21/00; E21B21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1377575A
Cited
US1395706A
Cited
US1919844A
Cited
US1967517A
Cited
US2117444A
Cited
US2633333A
Cited
US2595902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |