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Patent US2544639A successfully refreshed from Google Patents.
US2544639A
Expired / Lapsed
US
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Hydraulic tongs
Assignee: Individual
•
Filing: 1946-01-14
•
Granted: 1951-03-13
•
Expires: 1966-01-14
Abstract
No abstract record available.
Inventors
- 👤 Ingram X Calhoun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:47
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; E21B19/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1300995A
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US1386220A
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US1508704A
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US1478020A
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US1615695A
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US1925970A
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US2317306A
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US2429424A
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US2453369A
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US2450934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |