Device for monitoring and wirelessly indicating a pressure or a pressure change in pneumatic tires mounted on vehicles
US7464587B2 · kind B2 · utility
Inventors
Key dates
| Filing date | May 19, 2004 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | May 19, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/041
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A device for monitoring and wirelessly signaling a pressure, or a change in pressure, in pneumatic tires on vehicles having a pressure sensor for measuring the pressure or the change in pressure; a transmitter for transmitting a signal derived from the measuring signal of the pressure sensor; a control circuit that activates the transmitter only from time to time; a battery (1) as current source; and a back-up capacitor connected in parallel to the battery. A controllable switching unit is provided by means of which the back-up capacitor can be connected in parallel to the battery from time to time for a limited period of time only.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.