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Semi-conductive electrical heating device with voids

  • US 4,892,998 A
  • Filed: 12/29/1987
  • Issued: 01/09/1990
  • Est. Priority Date: 12/29/1987
  • Status: Expired due to Fees
First Claim
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1. An electrical heating device including a layer of semi-conductive material carried on an insulating surface and defining a semi-conductive pattern, and a pair of spaced-apart conductors electrically connected to said semi-conductive pattern, said device being characterized in thata first heating portion of said semi-conductive pattern intermediate said conductors includes a two-dimensional array of areas devoid of semi-conductive material ("voids") within a mesh of semi-conductive material, said voids being arranged such that the centers of the voids forming sets of three adjacent voids are positioned at the corners of equilateral triangles.

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