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Printed wire circuit board and its method of manufacture

  • US 4,791,248 A
  • Filed: 01/22/1987
  • Issued: 12/13/1988
  • Est. Priority Date: 01/22/1987
  • Status: Expired due to Fees
First Claim
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1. A conductive core printed wire circuit board, comprising:

  • (a) a printed wire circuit board having a conductive core and at least one oversized through-hole extending through the core;

    (b) a dielectric collar in the through-hole, the collar being a cured filled resin substantially free of voids, having a coefficient of thermal expansion closer to that of the core than the coefficient of thermal expansion of epoxy, and having a central bore drilled into the collar and(c) a conductive plating on the inner surface of the bore forming a plated-through-hole, the plating providing electrical connection between one side of the board and the other side but being electrically insulated from the core by the collar.

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