US3584388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heading reference system
Assignee: Aviation Electric Ltd
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Filing: 1968-05-28
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Granted: 1971-06-15
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Expires: 1988-05-28
Abstract
Abstract A HEADING REFERENCE SYSTEM FOR USE IN A VEHICLE TO COUNTERACT THE DISTORTING EFFECT OF THE METALLIC MASS OF THE VEHICLE BY DETERMINING THE DISTANCE OF THE VEHICLE FROM A PREDETERMINED STARTING POINT, DETERMING ITS DIRECTION OF TRAVEL AND PROVIDING RESOLVER UNITS FOR GENERATING SIGNALS TO COMPENSATE FOR THE PERMANENT MAGNETIC DISTURBANCE EFFECT OF THE EARTH''S MAGNETIC FIELD CONCENTRATED IN THE VEHICLE SO THAT HEADING REFERENCE INFORMATION CAN BE OBTAINED AS TO THE PRESENT POSITION AND DIRECTION OF TRAVEL OF THE VEHICLE.
Inventors
- 👤 Dimitri Petrov
- 👤 Robert W Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:14
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/10; G01C21/12; G01C17/00; G01C17/38; G08; G08G; G08G1/00; G08G1/123
Claims Analysis
Total Claims: 0
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |