Patent US3898615A successfully refreshed from Google Patents.
US3898615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire condition monitoring system
Assignee: Nissan Motor Co Ltd
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Filing: 1974-03-18
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Granted: 1975-08-05
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Expires: 1994-03-18
Abstract
Abstract A tire mounted sensor and rotatable coil are connected in series and a switch in the sensor closes when the tire pressure is low or the temperature is excessive. A feedback coil of an oscillator is mounted on the vehicle structure in such a manner as to be adjacent to the rotatable coil, and inductive coupling between the coils produces oscillation in the oscillator when alarm light or buzzer is energized in response to oscillation in the oscillator.
Inventors
- 👤 Akio Hosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:24
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0427; B60C23/0428
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A system for automatically detecting an abnormal condition of a vehicle tire, comprising: a sensor rotatable with the tire for detecting the abnormal condition; a rotatable coil concentrically mounted on a framework of a wheel on which the tire is fitted and connected in a series circuit arrangement with said sensor so that the impedance of the series circuit is reduced below a predetermined value by said sensor in response to the detected abnormal condition; an oscillator mounted on the vehicle structure including a pair of separate coils mounted adjacent to and on the inner side of said rotatable coil for inductive coupling therewith through said rotatable coil when the impedance of the series circuit is below said predetermined value; said pair of coils being spaced apart to face separate peripheral areas of said rotatable coilS; and an alarm device connected to said oscillator to produce a warning signal in response to oscillation therein; whereby when the impedance of the series circuit is below said predetermined value, inductive coupling between said fixed and rotatable coils allows sufficient feedback for said oscillator to produce oscillation therein.
Claim 2
Independent Claim
185 words
A system for automatically detecting an abnormal condition of a vehicle tire, comprising: a sensor rotatable with the tire for detecting the abnormal condition; a rotatable coil concentrically mounted on a framework of a wheel on which the tire is fitted and connected in a series circuit arrangement with said sensor so that the impedance of the series circuit is reduced below a predetermined value by said sensor in response to the detected abnormal condition; an oscillator mounted on the vehicle structure including a pair of separate coils mounted adjacent to and on the inner side of said rotatable coil for inductive coupling therewith through said rotatable coil when the impedance of the series circuit is below said predetermined value; said pair of coils being spaced apart to face separate peripheral areas of said rotatable coilS; and an alarm device connected to said oscillator to produce a warning signal in response to oscillation therein; whereby when the impedance of the series circuit is below said predetermined value, inductive coupling between said fixed and rotatable coils allows sufficient feedback for said oscillator to produce oscillation therein.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |