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Printed circuit board

  • US 5,061,551 A
  • Filed: 01/30/1990
  • Issued: 10/29/1991
  • Est. Priority Date: 02/06/1987
  • Status: Expired due to Fees
First Claim
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1. A printed circuit board comprising a non-conductive substrate and at least one conductive line printed on said substrate, said line comprising a U.V. cured ink comprising a cycloaliphatic epoxy resin containing 25-67 volume percent of silver-coated magnetite particles, said line having been subjected to a magnetic field sufficient to move the magnetite particles to a position at or near the upper level of said line so as to increase the conductivity of said line to the desired level and cured by exposure to U.V. radiation in the presence of a cationic photoinitiator.

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