US2417821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pilot for dirigible craft
Assignee: Sperry Gyroscope Co Inc
•
Filing: 1943-04-26
•
Granted: 1947-03-25
•
Expires: 1963-04-26
Abstract
No abstract record available.
Inventors
- 👤 William M Harcum
- 👤 Halpert Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:53
CPC Classifications
G; G01; G01C; G01C19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2137974A
Cited
US2191842A
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US2162862A
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US2210916A
Cited
US2310954A
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US2351977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-24 | 1950-09-23 | 1951-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-24 | 1954-09-23 | 1955-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-24 | 1958-09-23 | 1959-03-25 | $7700.00 | Window Closed / Lapsed |