US2675897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air control system
Assignee: Oil States Industries Inc
•
Filing: 1948-06-25
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Granted: 1954-04-20
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Expires: 1968-06-25
Abstract
No abstract record available.
Inventors
- 👤 Wilson John Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:51
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F16H61/0265; F16H61/0267; F16H61/0269; F16D; F16D48/00; F16D48/02; F16D48/0206; B; B60; B60K; B60K2702/00; B60K2702/08; B60K2702/10; B60K2702/14; F16D2048/0212; F16D2048/0221; F16D2048/0224; F16D2048/0257; F16D2048/0281; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19284; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19433
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169780A
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FR763846A
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US2328092A
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US2251445A
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US2280329A
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US2467829A
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US2450161A
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US2461218A
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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) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |