International Business Machines Corporation

Arthur E Graham

Alfred Viehbeck

Donald Wayne Stafford

Stephen L Tisdale

Harry R Bickford

Bruce M Cassidy

Deh C Tao

Dennis A Canfield

Robert J Huljak

Patsy A Bowlds

David L Fletcher

A dielectric substrate is conditioned for subsequent electroless plating thereon by contacting with a catalytic metal salt and then with a reducing agent and with an electroless metal plating bath followed by contacting with a second catalytic metal salt. In addition, a dielectric substrate is conditioned for electroless plating thereon by obtaining a substrate of a dielectric material that contains metal particles therein and contacting with a catalytic metal salt.

Conditioning of a substrate for electroless plating thereon

A printed circuit with an internal metal sheet for heat dissipation has a roughened aluminum sheet with via holes coated with acrylic or epoxy resin containing thixotropic fumed silicon dioxide or silicate clay. The resin and thixotropic agent are electrophoretically coated. The thixotropic agent may act both to even the coating around edges and as a material upon which metal plating of the printed circuit is bonded.

Electrophoretic insulation of metal circuit board core

Disclosed is a thermal transfer medium which comprises a mixture of a thermosetting polyimide, a thermoplastic polyimide, and graphite. It has a steel support layer and an intermediate layer of silicon dioxide. An outer layer on the steel is the thermal ink. The mixture is applied as a dispersion with a precursor of the thermosetting polyimide. The ribbon may be recoated at the typing station by applying a hot melt of the ink.

Resistive substrate for thermal printing ribbons comprising a mixture of

Disclosed is a thermal transfer medium which comprises a mixture of a thermosetting polyimide, a thermoplastic polyimide, and graphite. It has a steel support layer and an intermediate layer of silicon dioxide. An outer layer on the steel is the thermal ink. The mixture is applied as a dispersion with a precursor of the thermosetting polyimide. The ribbon may be recoated at the typing station by applying a hot-melt of the ink.

Silicon dioxide intermediate layer in thermal transfer medium

Growing community of inventors

Lexington, KY, United States of America

Arthur E Graham