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Passive tire pressure sensor and method

  • US 7,263,892 B2
  • Filed: 01/23/2006
  • Issued: 09/04/2007
  • Est. Priority Date: 08/04/2003
  • Status: Expired due to Fees
First Claim
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1. A membrane actuated sensor device comprising:

  • (a) a surface acoustical wave conductive body for transmitting a directional acoustical wave across at least a surface portion of the body;

    (b) at least one conductive contact disposed at a pre-selected location on the surface portion of the body disposed to receive and reflect the acoustical wave back as a reflected signal;

    (c) a flexible conductive membrane sealing against at least the surface portion of the body, the membrane being separated from the surface portion of the body by a cavity; and

    (e) the conductive membrane deforming toward the surface portion to contact the conductive contact and modulate the signal reflected by the one conductive contact.

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