US2547552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic hydraulic-mechanical follow-up control system
Assignee: North American Aviation Corp
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Filing: 1948-05-11
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Granted: 1951-04-03
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Expires: 1968-05-11
Abstract
No abstract record available.
Inventors
- 👤 John P Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:45
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/08; F15B9/12; B; B64; B64C; B64C13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US334238A
Cited
US2016727A
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US2263470A
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US2389274A
Cited
US2286256A
Cited
US2438317A
Cited
US2462915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |