Patent US3052831A successfully refreshed from Google Patents.
US3052831A
Expired / Lapsed
US
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Altitude and directional control servosystem
Assignee: Individual
•
Filing: 1960-02-08
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Granted: 1962-09-04
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Expires: 1980-02-08
Abstract
No abstract record available.
Inventors
- 👤 William S Lewis
- 👤 Donald H Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:00
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2126910A
Cited
US2334704A
Cited
US2405228A
Cited
US2474618A
Cited
US2657350A
Cited
US2866141A
Cited
US2808545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |