US3457547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle detector
Assignee: RCA Corp
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Filing: 1966-08-01
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Granted: 1969-07-22
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Expires: 1986-08-01
Abstract
No abstract record available.
Inventors
- 👤 George W Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:31
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A VEHICLE DETECTOOR COMPRISING: A TUNED CIRCUIT INCLUDING A LOOP, LEAD-IN WIRES AND A TUNING CAPACITOR CONNECTED IN SERIES, MEANS RESPONSIVE TO THE PRESENCE OF A VEHICLE IN OR IN CLOSE VICINITY TO SAID LOOP TO VARY THE TUNING OF SAID TUNED CIRCUIT, SAID TUNED CIRCUIT ALSO VARYING IN TUNING WITH VARIATIONS OF TEMPERATURE THEREOF, AND MEANS TO DECREASE THE VARITION OF TUNING OF SAID TUNED CIRCUIT DUE TO CHANGES OF TEMPERATURE THEREOF COMPRISING INSULATION FOR SAID LEAD-IN WIRES HAVING A CHANGE IN SPECIFIC INDUCTIVE CAPACITY OF ABOUT 1/100 OF ONE PERCENT PER DEGREE C., AND MEANS RESPONSIVE TO CHANGES IN TUNING OF SAID TUNED CIRCUIT TO INDICATE THE PRESENCE OF A VEHICLE IN OR IN THE VICINITY OF SAID LOOP.
Claim 2
Dependent Claim
121 words
A VEHICLE DETECTOOR COMPRISING: A TUNED CIRCUIT INCLUDING A LOOP, LEAD-IN WIRES AND A TUNING CAPACITOR CONNECTED IN SERIES, MEANS RESPONSIVE TO THE PRESENCE OF A VEHICLE IN OR IN CLOSE VICINITY TO SAID LOOP TO VARY THE TUNING OF SAID TUNED CIRCUIT, SAID TUNED CIRCUIT ALSO VARYING IN TUNING WITH VARIATIONS OF TEMPERATURE THEREOF, AND MEANS TO DECREASE THE VARITION OF TUNING OF SAID TUNED CIRCUIT DUE TO CHANGES OF TEMPERATURE THEREOF COMPRISING INSULATION FOR SAID LEAD-IN WIRES HAVING A CHANGE IN SPECIFIC INDUCTIVE CAPACITY OF ABOUT 1/100 OF ONE PERCENT PER DEGREE C., AND MEANS RESPONSIVE TO CHANGES IN TUNING OF SAID TUNED CIRCUIT TO INDICATE THE PRESENCE OF A VEHICLE IN OR IN THE VICINITY OF SAID LOOP.
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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |