US4240061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for the measurement of the physical state of a pneumatic tire
Assignee: BTR Industries Ltd
•
Filing: 1979-02-23
•
Granted: 1980-12-16
•
Expires: 1999-02-23
Abstract
Abstract A system for conveying to the driver of a vehicle information concerning the physical state of a tire, such as its inflation pressure, comprising an electrical signaling device mounted on the wheel and arranged to transmit signals to the driver via a circuit including a conduction path through the ground or road surface on which the vehicle is supported.
Inventors
- 👤 Ellis Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:15
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/04; G01K13/08; B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/20; G01L; G01L17/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A system for conveying to the driver of a vehicle information concerning the physical state of a pneumatic tire fitted to a wheel of the vehicle comprising a sensing device associated with the tire and mounted on the tire or wheel for rotation therewith, a signaling device incorporated in or associated with the sensing device to generate an electrical signal bearing a known relationship to the physical state to which the sensing device is responsive, a transmitting element associated with the tire to which said electrical signal is communicated, a receiving element arranged to be in communication with the transmitting element in an electrical circuit path means comprising a portion of the tire in contact with the ground or road surface on which the vehicle is supported, the ground or road surface, and an indicating device responsive to signals received by the receiving element.
Claim 2
Independent Claim
144 words
A system for conveying to the driver of a vehicle information concerning the physical state of a pneumatic tire fitted to a wheel of the vehicle comprising a sensing device associated with the tire and mounted on the tire or wheel for rotation therewith, a signaling device incorporated in or associated with the sensing device to generate an electrical signal bearing a known relationship to the physical state to which the sensing device is responsive, a transmitting element associated with the tire to which said electrical signal is communicated, a receiving element arranged to be in communication with the transmitting element in an electrical circuit path means comprising a portion of the tire in contact with the ground or road surface on which the vehicle is supported, the ground or road surface, and an indicating device responsive to signals received by the receiving element.
Claim 3
Independent Claim
154 words
A system for conveying to the driver of a vehicle information concerning the physical state of a pneumatic tire fitted to a wheel of the vehicle comprising a sensing device associated with the tire and mounted on the tire or wheel for rotation therewith, a signaling device incorporated in or associated with the sensing device to generate an electrical signal bearing a known relationship to the physical state to which the sensing device is responsive, said signal being in the form of electrical oscillations, a transmitting element associated with the tire to which said electrical oscillations are communicated, a receiving element arranged to be in electrical communication with the transmitting element in an electrical circuit path means comprising a portion of the tire in contact with the ground or road surface on which the vehicle is supported, the ground or road surface, and an indicating device responsive to signals received by the receiving element.
Claim 4
Independent Claim
154 words
A system for conveying to the driver of a vehicle information concerning the physical state of a pneumatic tire fitted to a wheel of the vehicle comprising a sensing device associated with the tire and mounted on the tire or wheel for rotation therewith, a signaling device incorporated in or associated with the sensing device to generate an electrical signal bearing a known relationship to the physical state to which the sensing device is responsive, said signal being in the form of electrical oscillations, a transmitting element associated with the tire to which said electrical oscillations are communicated, a receiving element arranged to be in electrical communication with the transmitting element in an electrical circuit path means comprising a portion of the tire in contact with the ground or road surface on which the vehicle is supported, the ground or road surface, and an indicating device responsive to signals received by the receiving element.
Claim 5
Dependent Claim
46 words
A system according to claim 2 wherein the signaling device comprises an electrical oscillator associated with a sensing device in the form of a pressure responsive switch arranged to connect a power supply to the oscillator whenever the tire inflation pressure falls below a predetermined value.
Claim 6
Dependent Claim
59 words
A system according to claim 3 wherein the oscillator and pressure-responsive switch are mounted, with a power supply cell, inside the tire/rim cavity and the output from the oscillator is connected at one side to the wheel and at the other side to a transmitting element in the form of a conductor contacting the inner surface of the tire.
Claim 7
Dependent Claim
45 words
A system according to claim 4 wherein a part of the conductor lies freely inside the tire/rim cavity and is arranged so that it is moved under centrifugal force as the wheel rotates to contact the inner surface of the tread region of the tire.
Claim 8
Dependent Claim
37 words
A vehicle comprising a system in accordance with claim 2 wherein at least one wheel is carried on a support which is insulated to a considerable extent from the vehicle body, said support constituting a receiving element.
Claim 9
Dependent Claim
30 words
A vehicle comprising a system in accordance with claim 2 wherein a receiving element insulated from the vehicle chassis and wheels is arranged to receive signals from an adjacent tire.
References Cited (Backward Citations)
US3895347A
Cited
US3950726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |