US2501998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roto-volumetric pump
Assignee: Individual
•
Filing: 1939-02-18
•
Granted: 1950-03-28
•
Expires: 1959-02-18
Abstract
No abstract record available.
Inventors
- 👤 Dutrey Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:43
CPC Classifications
F; F04; F04C; F04C11/00; F04C11/001; F04C9/00; F04C9/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US273737A
Cited
GB218560A
Cited
US1678050A
Cited
US1777923A
Cited
US2043544A
Cited
US2040178A
Cited
DE634271C
Cited
US2087772A
Cited
US2049775A
Cited
US2212497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |