Ppg Industries, Inc.

James J. Finley

Amy M. Roginski

Charles Richard Coleman

Terry L. Wolfe

Frank Howard Gillery

Pamela L. Martino

Thomas M. Carter

Russell C. Criss

John A. Winter

Pamela L Martino

James J Finley

Russell C Criss

Charles R Coleman

Frank H Gillery

John A Winter

Terry L Wolfe

Randy R Kadunce

Thomas M Carter

Amy M Roginski

Paul W Bush

An electrically heatable windshield with a hidden bus bar configuration. A border of opaque ceramic material, preferably a lead borosilicate enamel, is bonded to an interior surface of the transparency about its periphery. Opposing electroconductive bus bars, preferably a low frit content silver-containing ceramic material, are bonded to the ceramic material so that the entire inner edge of the bus bar overlays a portion of the ceramic material and is spaced from the inner edge of the border, providing an intermediate portion of the border between the bus bars and transparency surface that is not covered by the bus bars. An electro-conductive coating is applied to the transparency to interconnect the bus bars and covers to the inner surface of the transparency, the bus bars and the intermediate portion of the ceramic material border so that electric current flowing between the bus bars must flow through the portion of the coating that covers the intermediate portion of the border.

Electrically heatable transparency

The number of bent laminated glass windshields having bull's-eyes that adversely affect its optical properties is reduced by using amorphous precipitated silica particles such as is used as flatting agents for paints, as a parting material between a pair of glass sheets during bending. The particles form relatively soft agglomerates that are milled and classified to produce a narrow distribution of particle sizes as compared to the distribution found in untreated silica, such as diatomaceous earths previously used as a parting material.

Method of using amorphous precipitated silica parting material for

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New Kensington, PA, United States of America

Pamela L Martino