Patent US2623688A successfully refreshed from Google Patents.
US2623688A
Expired / Lapsed
US
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Rotary power conversion machine
Assignee: Power Jets Research and Development Ltd
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Filing: 1946-12-09
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Granted: 1952-12-30
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Expires: 1966-12-09
Abstract
No abstract record available.
Inventors
- 👤 Davidson Ivor Macaulay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:49
CPC Classifications
F; F04; F04D; F04D21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1518501A
Cited
US2004571A
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GB417170A
Cited
US2201099A
Cited
GB479427A
Cited
US2378372A
Cited
US2224519A
Cited
US2219937A
Cited
US2426270A
Cited
US2435236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |