Patent US3167698A successfully refreshed from Google Patents.
US3167698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autopilot employing earth inductor compass
Assignee: General Precision Inc
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Filing: 1961-08-15
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Granted: 1965-01-26
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Expires: 1981-08-15
Abstract
No abstract record available.
Inventors
- 👤 John W Gray
- 👤 Bois Norman L Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:08
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/02; G05D1/0206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN AUTOPILOT FOR A CRAFT COMPRISING, AN EARTH INDUCTOR COMPASS INCLUDING A SENSING COIL, MEANS EXCITING SAID COMPASS WHEREBY AN OUTPUT SIGNAL IS GENERATED THEREBY, MEANS DEMODULATING SAID OUTPUT SIGNAL, MEANS AMPLIFYING SAID DEMODULATED OUTPUT SIGNAL, A MOTOR ENERGIZED BY SAID AMPLIFIED SIGNAL DEFLECTING A RUDDER LOCATED ON SAID CRAFT, SAID NEGATIVE FEEDBACK MEANS APPLYING A SIGNAL THE MAGNITUDE OF WHICH IS REPRESENTATIVE OF THE AMOUNT OF DEFLECTION OF SAID RUDDER TO SAID SENSING COIL IN A DIRECTION SUCH AS TO GENERATE A MAGNETIC FLUX OPPOSING THE EARTH''S FLUX PASSING THROUGH SAID INDUCTOR COMPASS.
Claim 2
Dependent Claim
94 words
AN AUTOPILOT FOR A CRAFT COMPRISING, AN EARTH INDUCTOR COMPASS INCLUDING A SENSING COIL, MEANS EXCITING SAID COMPASS WHEREBY AN OUTPUT SIGNAL IS GENERATED THEREBY, MEANS DEMODULATING SAID OUTPUT SIGNAL, MEANS AMPLIFYING SAID DEMODULATED OUTPUT SIGNAL, A MOTOR ENERGIZED BY SAID AMPLIFIED SIGNAL DEFLECTING A RUDDER LOCATED ON SAID CRAFT, SAID NEGATIVE FEEDBACK MEANS APPLYING A SIGNAL THE MAGNITUDE OF WHICH IS REPRESENTATIVE OF THE AMOUNT OF DEFLECTION OF SAID RUDDER TO SAID SENSING COIL IN A DIRECTION SUCH AS TO GENERATE A MAGNETIC FLUX OPPOSING THE EARTH''S FLUX PASSING THROUGH SAID INDUCTOR COMPASS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-01-26 | 1968-07-27 | 1969-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-26 | 1972-07-27 | 1973-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-26 | 1976-07-27 | 1977-01-26 | $7700.00 | Window Closed / Lapsed |