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Patent US2440441A successfully refreshed from Google Patents.
US2440441A
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Tool joint
Assignee: Ventura Tool Co
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Filing: 1943-08-07
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Granted: 1948-04-27
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Expires: 1963-08-07
Abstract
No abstract record available.
Inventors
- 👤 James W E Hanes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:11
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1054812A
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US1265706A
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US1455971A
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US1494693A
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US1613039A
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US1756205A
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US1810948A
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US2087185A
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US2247173A
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US2301495A
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US2298049A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-27 | 1951-10-27 | 1952-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-27 | 1955-10-27 | 1956-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-27 | 1959-10-27 | 1960-04-27 | $7700.00 | Window Closed / Lapsed |