US Patent 7350417 Pressure sensor with conductive laminate membrane

A pressure sensor (30) for sensing a fluid pressure in harsh environments such as the air pressure in a tire, by using a chamber (58) partially defined by a flexible membrane (50), the flexible membrane (50) is a laminate having at least two layers wherein at least one of the layers is at least partially formed from conductive material, and the chamber (58) containing a fluid at a reference pressure, such that the flexible membrane (50) deflects from any pressure difference between the reference pressure and the fluid pressure; and,associated circuitry (34) for converting deflection of the flexible membrane (50) into an output signal indicative of the fluid pressure.