Patent US2901979A successfully refreshed from Google Patents.
US2901979A
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Hydraulic unit with improved piston assembly
Assignee: North American Aviation Corp
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Filing: 1953-07-24
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Granted: 1959-09-01
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Expires: 1973-07-24
Abstract
No abstract record available.
Inventors
- 👤 Henrichsen Knut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:08
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0082; F01B3/0085; F01B3/0088; F01B3/0032; F01B3/0044; F01B3/0047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733666A
Cited
US2299235A
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GB532617A
Cited
US2608159A
Cited
US2604856A
Cited
US2721519A
Cited
US2674196A
Cited
US2638850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |