US3561129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
North-seeking system
Assignee: United States Department of the Army
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Filing: 1966-12-27
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Granted: 1971-02-09
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Expires: 1986-12-27
Abstract
Abstract A SYSTEM USING A PENDULOUS, INTEGRATING, GYROSCOPE ACCELEROMETER ROTATED ABOUT ITS GRAVITY AXIS, IN A LEVEL PLANE ON THE EARTH. THE ROTATION VELOCITY OF THE EARTH CAUSE THE PENDULOUS MASS TO EXERT A VARYING PRECESSIONAL FORCE ON THE GYROSCOPE. THE FORCE IS DETECTED AND CORRELATED WITH THE ANGULAR POSITION OF THE ACCELEROMETER TO DETERMINE NORTH.
Inventors
- 👤 James V Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:24
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; G01C19/38; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1261
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |