US2512593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary vane fluid pressure machine
Assignee: FRANK L DAVIS
•
Filing: 1943-12-27
•
Granted: 1950-06-27
•
Expires: 1963-12-27
Abstract
No abstract record available.
Inventors
- 👤 William F Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:29
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/352
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US797621A
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GB189921340A
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FR323564A
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US812688A
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FR395492A
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US1221333A
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US1558696A
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US1607383A
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US1737942A
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CH133555A
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US1670229A
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US2001011A
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US2033218A
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US2233269A
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US2370934A
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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) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |