Patent US3308710A successfully refreshed from Google Patents.
US3308710A
Expired / Lapsed
US
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Ground velocity indicator for vehicles utilizing two scanning rates
Assignee: General Precision Inc
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Filing: 1963-06-14
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Granted: 1967-03-14
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Expires: 1983-06-14
Abstract
No abstract record available.
Inventors
- 👤 Stavis Gus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:30
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/80; G01P3/806
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A VELOCITY SENSOR FOR USE IN VEHICLES TRAVELLING IN CLOSE PROXIMITY TO A SUPPORTING SURFACE COMPRISING, SERVO MEANS, MEANS DRIVEN BY SAID SERVO MEANS FOR OPTICALLY SCANNING A SMALL AREA OF THE SUPPORTING SURFACE, PRODUCING AN OPTICAL IMAGE OF SAID SURFACE THE APPARENT MOTION OF SAID OPTICAL IMAGE BEING A FUNCTION OF THE VELOCITY AT WHICH SAID MEANS IS DRIVEN AND THE VELOCITY OF SAID VEHICLE, ELECTRONIC MEANS FOR CONVERTING SAID OPTICAL IMAGE INTO A SERIES OF SUCCESSIVE ELECTRIC WAVE TRAINS, MEANS RESPONSIVE TO SUCCESSIVE ELECTRIC WAVE TRAINS FOR PRODUCING AN ERROR SIGNAL CORRESPONDING TO THE RELATIVE PHASE DISPLACEMENT OF SUCCESSIVE ELECTRIC WAVE TRAINS, BISTABLE MEANS FOR ALTERNATELY PROVIDING POSITIVE AND NEGATIVE VOLTAGES, MEANS FOR CONTROLLING THE VELOCITY OF SAID SERVO MEANS RESPONSIVE TO SAID ERROR SIGNAL AND THE OUTPUT OF SAID BISTABLE MEANS WHEREBY THE RATE OF OPTICAL SCAN IS ALTERNATELY EQUALLY ABOVE AND BELOW SAID VEHICLE VELOCITY, AND SPEED INDICATOR MEANS OPERATED BY SAID SERVO MEANS.
Claim 2
Dependent Claim
158 words
A VELOCITY SENSOR FOR USE IN VEHICLES TRAVELLING IN CLOSE PROXIMITY TO A SUPPORTING SURFACE COMPRISING, SERVO MEANS, MEANS DRIVEN BY SAID SERVO MEANS FOR OPTICALLY SCANNING A SMALL AREA OF THE SUPPORTING SURFACE, PRODUCING AN OPTICAL IMAGE OF SAID SURFACE THE APPARENT MOTION OF SAID OPTICAL IMAGE BEING A FUNCTION OF THE VELOCITY AT WHICH SAID MEANS IS DRIVEN AND THE VELOCITY OF SAID VEHICLE, ELECTRONIC MEANS FOR CONVERTING SAID OPTICAL IMAGE INTO A SERIES OF SUCCESSIVE ELECTRIC WAVE TRAINS, MEANS RESPONSIVE TO SUCCESSIVE ELECTRIC WAVE TRAINS FOR PRODUCING AN ERROR SIGNAL CORRESPONDING TO THE RELATIVE PHASE DISPLACEMENT OF SUCCESSIVE ELECTRIC WAVE TRAINS, BISTABLE MEANS FOR ALTERNATELY PROVIDING POSITIVE AND NEGATIVE VOLTAGES, MEANS FOR CONTROLLING THE VELOCITY OF SAID SERVO MEANS RESPONSIVE TO SAID ERROR SIGNAL AND THE OUTPUT OF SAID BISTABLE MEANS WHEREBY THE RATE OF OPTICAL SCAN IS ALTERNATELY EQUALLY ABOVE AND BELOW SAID VEHICLE VELOCITY, AND SPEED INDICATOR MEANS OPERATED BY SAID SERVO MEANS.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |