Patent ID: 7607346
Filing Date: 2009-10-27
Classification: B60C

Abstract:
1. A tire pressure indicator (TPI) that functions in combination with a vehicle tire stem that has a conventional Schrader-type tire-valve core removed and that has an upper end that includes a set of outer threads and a lower end that includes a spring retainer, said TPI comprising: A. a valve core that is designed to be inserted into the vacated vehicle tire stem, said valve core comprising: B. a control cap that interfaces with the valve plug and that attaches to the upper end of the vehicle valve stem, C. a tire-pressure transmitting unit (TPTU) that is enclosed within said control cap, said TPTU having means for receiving and processing a high pressure signal and a low pressure signal, and producing and transmitting an encoded R.F. signal that corresponds to either an encoded high pressure signal or an encoded low pressure signal, D. a tire-pressure monitoring unit (TPMU) that is located remotely from said TPTU, said TPMU having means for receiving and processing the encoded R.F. signal from said TPTU and means for producing: E. means for preventing said TPTU from transmitting false high or low tire pressure signals that result from changes in the ambient temperature and/or normal tire temperature fluctuations that vary from a base temperature that corresponds to a preset tire pressure.