US2531094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual power unit for duplex pump
Assignee: Individual
•
Filing: 1946-07-02
•
Granted: 1950-11-21
•
Expires: 1966-07-02
Abstract
No abstract record available.
Inventors
- 👤 Russell R Waterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:27
CPC Classifications
F; F01; F01L; F01L21/00; F01L21/02; F01L25/00; F01L25/02; F01L25/04; F04; F04B; F04B1/00; F04B1/02; F04B5/00; F04B5/02; F04B53/00; F04B53/10; F04B9/00; F04B9/08; F04B9/12; F04B9/129; F04B9/131; F04B9/133; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18248; Y10T74/18256
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |