Reinforced dielectric sheet
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United States of America Patent
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Aug 15, 1989
Issued Date -
N/A
app pub date -
May 5, 1988
filing date -
Mar 17, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reinforced porous dielectric sheet of expanded polytetrafluoroethylene is provided wherein solid plastic reinforcement elements in the form of circular columns or wall-like partitions extending through the dielectric sheet from one surface to the other are distributed within the sheet. The reinforced sheet is useful as a substrate for printed circuit boards. The reinforcement elements are preferably of a tetrafluoroethylene/ethylene copolymer or an epoxy resin.
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