Patent US2498826A successfully refreshed from Google Patents.
US2498826A
Expired / Lapsed
US
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Variable volume rotary vane pump
Assignee: Individual
•
Filing: 1946-10-18
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Granted: 1950-02-28
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Expires: 1966-10-18
Abstract
No abstract record available.
Inventors
- 👤 Ruona Arthur Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:49
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F01C21/0818; F01C21/0827; F01C21/0845; F04C14/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1437706A
Cited
FR542945A
Cited
US1538075A
Cited
US1698235A
Cited
US1855708A
Cited
FR733547A
Cited
US2054207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |