Patent US2415429A successfully refreshed from Google Patents.
US2415429A
Expired / Lapsed
US
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Aircraft altitude control
Assignee: Sperry Gyroscope Co Inc
•
Filing: 1942-02-13
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Granted: 1947-02-11
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Expires: 1962-02-13
Abstract
No abstract record available.
Inventors
- 👤 Kellogg Spencer
- 👤 Gerald N Hanson
- 👤 Theodore W Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:28
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/042; G01; G01C; G01C19/00
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) | 1950-02-10 | 1950-08-12 | 1951-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-10 | 1954-08-12 | 1955-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-10 | 1958-08-12 | 1959-02-11 | $7700.00 | Window Closed / Lapsed |