Patent US2900921A successfully refreshed from Google Patents.
US2900921A
Expired / Lapsed
US
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Hydraulic pumps and motors
Assignee: Dowty Hydraulic Units Ltd
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Filing: 1957-02-25
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Granted: 1959-08-25
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Peter H Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:27
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0052; F01B3/007; F01B3/0073; F01B3/0076; F01B3/10; F01B3/103; F01B3/106; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18024
Claims Analysis
Total Claims: 0
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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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |