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Window defogging system with optically clear overlay having multi-layer silver bus bars and electrically isolating peripheral grooves

  • US 5,354,966 A
  • Filed: 01/31/1994
  • Issued: 10/11/1994
  • Est. Priority Date: 12/02/1991
  • Status: Expired due to Fees
First Claim
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1. A window defogger system comprising:

  • (a) a power supply mounted in a housing; and

    (b) an optically clear overlay suitable for positioning on one surface of a window to be defogged, said optically clear overlay comprising;

    (i) an indium tin oxide (ITO) substrate including a sheet of heat stabilized polyester, a hard coat layer on one surface of said sheet of heat stabilized polyester and an ITO layer located on the other surface of said sheet of heat stabilized polyester, said ITO layer including means for electrically isolating the edge of said ITO layer from an interior heating zone;

    (ii) a pair of bus bars located along opposing edges of said interior heating zone, said bus bars being formed of multiple layers of silver deposited atop said ITO layer; and

    (iii) attachment means for mounting said power supply housing on said optically clear overlay and connecting said bus bars to said power supply.

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