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Spark arrestor

  • US 4,400,754 A
  • Filed: 11/27/1981
  • Issued: 08/23/1983
  • Est. Priority Date: 11/27/1981
  • Status: Expired due to Fees
First Claim
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1. A spark arrestor for protecting a ballast connected to a high intensity, gaseous discharge lamp, comprisinga substrate disc of low dielectric material having substantially no capacitance,a first side electrical conductive material affixed to a first side of said substrate disc,a second side electrical conductive material affixed to a second side of said substrate disc,said first side material and said second side material both being patterned on the substrate disc to include a plurality of points near the peripheral edge of said substrate, the points of the material on each side being respectively substantially aligned,a first electrical terminal affixed to said first side material, anda second electrical terminal affixed to said second side material,said first terminal and said second terminal providing connection across the ballast,a large electrical charge between said first terminal and said second terminal discharging around the peripheral edge of the substrate disc from at least one point of said first side material to the corresponding point of said second side material.

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