Patent US2737839A successfully refreshed from Google Patents.
US2737839A
Expired / Lapsed
US
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Tongs for coupling and uncoupling drill pipe joints
Assignee: Joy Manufacturing Co
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Filing: 1952-06-02
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Granted: 1956-03-13
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Expires: 1972-06-02
Abstract
No abstract record available.
Inventors
- 👤 Win W Paget
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:23
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; E21B19/161; E21B19/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1629895A
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US1614328A
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US1812351A
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US1906696A
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US2546224A
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US2450934A
Cited
US2581667A
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US2495834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |