International Business Machines Corporation

James W Knight

Anilkumar Chinuprasad Bhatt

Donald E Doran

Michael J Cibulsky

Lawrence J Hugaboom

Woven glass cloth and method of its manufacture suitable for use as a resin-impregnated substrate for printed circuits in which the major dimension or transverse axis of the elliptical warp yarns exceeds a predetermined fraction of that dimension of the fill yarns of the woven cloth. Multi-filament warp yarns are typically subjected to tensile stress during weaving and firing such that the yarn compaction prevents the thorough impregnation by a resin. The result is that voids are maintained along the innermost filaments of the yarn. These voids, when filled with materials other than resin, such as plating solution, ultimately produce circuit failures.

Glass cloth for printed circuits and method of manufacture wherein yarns

Woven glass fiber cloth for printed circuit substrates in which the warp is of plied yarn and the fill is of unplied or twisted yarn to facilitate more thorough polymeric resin impregnation and achieve improved dimensional stability.

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Endicott, NY, United States of America

James W Knight