Patent US2944790A successfully refreshed from Google Patents.
US2944790A
Expired / Lapsed
US
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Drum wassembly
Assignee: Oil States Industries Inc
•
Filing: 1956-11-27
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Granted: 1960-07-12
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Expires: 1976-11-27
Abstract
No abstract record available.
Inventors
- 👤 Wilson John Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:36
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/02; B66D1/14; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0158
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US847572A
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DE607489C
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US1874625A
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US1906519A
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US2240741A
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US2304350A
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US2507256A
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US2468388A
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US2628814A
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US2526525A
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US2664112A
Cited
US2703161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |