Patent US2509321A successfully refreshed from Google Patents.
US2509321A
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Rotary fluid unit for take-off under variable control
Assignee: Gulf Research and Development Co
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Filing: 1946-07-19
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Granted: 1950-05-30
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Expires: 1966-07-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward Topanelian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:32
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/10; F04C14/14; B; B66; B66D; B66D1/00; B66D1/02; B66D1/14; F04C2/00; F04C2/08; F04C2/10; F04C2/102; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/437; F16H61/44; F16H61/448; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0158
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191226279A
Cited
US1482807A
Cited
US1660464A
Cited
US2321880A
Cited
US2416801A
Cited
US2414197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |