Darrel R Nelson

US Patent:

44205856, Dec 13, 1983

Filed:

Aug 30, 1982

Appl. No.:

6/412545

Inventors:

Michael C. H. Lee - Sterling Heights MI
Darrel S. Nelson - Warren MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

C08K 304
C08K 336
C08L 700
C08L 1100

US Classification:

524548

Abstract:

A method of mixing crosslinkable elastomeric polymers and reinforcing fillers has been developed that yields significant improvements in physical properties compared to like polymers mixed by conventional methods. The method entails working a filler-polymer mixture at a temperature between the glass transition temperature and the liquid-liquid temperature of the uncrosslinked polymer to enhance filler integration. The mixture is then heated to a temperature greater than the flow temperature of the uncrosslinked polymer and worked so that air bubbles dispersed in the mixture are eliminated. The heating and cooling steps are repeated until the filler particles are thoroughly integrated and substantially all air bubbles are eliminated.

US Patent:

52218287, Jun 22, 1993

Filed:

Jul 16, 1992

Appl. No.:

7/914276

Inventors:

Rafil A. Basheer - Rochester MI
Ismat A. Abu-Isa - Rochester Hills MI
Darrel S. Nelson - Warren MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

B60L 102
H05G 306
A47L 100

US Classification:

219202

Abstract:

A heated wiper blade has a conductive elastomer body and a pair of electrodes along each side of the body. The elastomer which has a resistivity in the range of 20-128 ohm-cm and a hardness of Shore A 64-70 comprises a rubber compound including carbon black in the range of 37-60 phr, a small amount of graphite in the range of 13 to 20 phr and a low concentration of plasticizer oil in the range 20-40 phr.