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Patent US2993643A successfully refreshed from Google Patents.
US2993643A
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US
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Pilot's automatic dead reckoning equipment
Assignee: Individual
•
Filing: 1958-02-06
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Granted: 1961-07-25
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Expires: 1978-02-06
Abstract
No abstract record available.
Inventors
- 👤 Pliny G Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:16
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1985266A
Cited
US2403152A
Cited
US2714047A
Cited
US2936950A
Cited
US2818211A
Cited
US2923468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |