Patent US2483705A successfully refreshed from Google Patents.
US2483705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary engine, pump, and the like
Assignee: Keelavite Co Ltd
•
Filing: 1942-08-25
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Granted: 1949-10-04
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Expires: 1962-08-25
Abstract
No abstract record available.
Inventors
- 👤 Levetus Francis Benjamin
- 👤 Johnson Edward Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:48
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1640169A
Cited
DE665963C
Cited
US2049092A
Cited
US2181962A
Cited
US2258504A
Cited
US2202912A
Cited
US2236556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-03 | 1953-04-04 | 1953-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-03 | 1957-04-04 | 1957-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-03 | 1961-04-04 | 1961-10-04 | $7700.00 | Window Closed / Lapsed |