Edward D Sherman

Author:

Edward F. Sherman

ISBN #:

0314007695

Author:

Edward F. Sherman

ISBN #:

0314061053

Author:

Edward F. Sherman

ISBN #:

0314147349

Author:

Edward F. Sherman

ISBN #:

0314156135

Author:

Edward F. Sherman

ISBN #:

0314166521

Author:

Edward F. Sherman

ISBN #:

0314211241

Author:

Edward F. Sherman

ISBN #:

0314238018

Author:

Edward F. Sherman

ISBN #:

0314241213

US Patent:

51925907, Mar 9, 1993

Filed:

Dec 18, 1989

Appl. No.:

7/452170

Inventors:

Edward S. Sherman - Sunnyvale CA

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

B05D 310

US Classification:

427304

Abstract:

A method of coating metal on a poly(aryl ether ketone) surface comprises treating the surface with a swelling agent, removing the swelling agent, etchinig the treated surface and then plating the etched surface with a metal using an electroless plating process. The process can be used to metal plate articles of poly(aryl ether ketones) of complex shapes, such as electrical connectors. Exceptional bond strength between the metal and the poly(aryl ether ketone) surface is obtained. Poly(aryl ether ketone) compositions, even those containing little, or no, glass or mineral fillers can be plated with a strongly adherent coating of plated metal using a process of this invention. The poly(aryl ether ketone) may contain additives such as pigments, fillers, stabilizers, reinforcing agents or the like. Blends of poly(aryl ether ketones) with other polymers, such as polyetherimides, fluoroelastomers, or the like, can be treated in accordance with this invention.

US Patent:

50394525, Aug 13, 1991

Filed:

May 13, 1988

Appl. No.:

7/193970

Inventors:

Mark S. Thompson - San Carlos CA
Gary H. Wiseman - San Francisco CA
Edward S. Sherman - Sunnyvale CA

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

H01B 106

US Classification:

252518

Abstract:

This invention provides a process for making metal oxide varistor precursor powder comprising (a) dissolving soluble precursors of the additive metal oxides, e. g. bismuth nitrate as precursor for bismuth oxide, in an aqueous solution, (b) forming a suspension or slurry in the aqueous solution of a powder of the desired primary metal oxide, e. g. zinc oxide, having the desired particle size, (c) adding a precipitating reagent to convert the additive metal from the soluble precursor form to the oxide or hydrous oxide form and precipitate the oxide or hydrous oxide in the presence of the primary metal oxide particles, (d) removing water and by-product salts to form a powder. The resulting varistor precursor powder contains smaller particles of the additive metal oxides evenly distributed throughout larger particles of the primary metal oxide. Varistors prepared from the resulting powder can be sintered at temperatures lower than conventionlly used, for example 900. degree. C. -1000. degree. C. and the resulting varistors exhibit properties of volts per grain boundary value higher than conventional varistors for example 3. 75 to 4.

US Patent:

49103890, Mar 20, 1990

Filed:

Jun 3, 1988

Appl. No.:

7/202762

Inventors:

Edward S. Sherman - Sunnyvale CA
Mark S. Thompson - San Carlos CA
Andrew Tomlinson - Palo Alto CA

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

H05B 310
H01B 106

US Classification:

219548

Abstract:

A conductive polymer composition which exhibits PTC behavior comprises a crystalline organic polymer, carbon black, and a high resistivity particulate filler. The high resistivity filler is semiconductive and has a resistivity at least 100 times that of the carbon black. Compositions of the invention exhibit good resistance stability when exposed to thermal cycling. They are useful in electrical devices requiring compositions with high resistivity.