Patent US2525907A successfully refreshed from Google Patents.
US2525907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary hydraulic pump
Assignee: Individual
•
Filing: 1943-09-16
•
Granted: 1950-10-17
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Expires: 1963-09-16
Abstract
No abstract record available.
Inventors
- 👤 Johnston Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:30
CPC Classifications
F; F04; F04C; F04C3/00; F04C3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2154456A
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US2211417A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |