US2498972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump
Assignee: Individual
•
Filing: 1944-12-04
•
Granted: 1950-02-28
•
Expires: 1964-12-04
Abstract
No abstract record available.
Inventors
- 👤 Frank A Whiteley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:45
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/352; F04C18/00; F04C18/30; F04C18/34; F04C18/344
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2352748A
Cited
US1051360A
Cited
US1573683A
Cited
US1610748A
Cited
US1635006A
Cited
US2233082A
Cited
US2178425A
Cited
US2241824A
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 |