Patents by Inventor Jeffrey E. Stemke

Jeffrey E. Stemke has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Lubricating oil containing hydroperoxidized ethylene copolymers and terpolymers as dispersants and V.I. improvers
    Patent number: 4925579
    Abstract: Lubricating oil compositions containing multifunctional additives, e.g. sludge dispersants and V.I. improvers, and the use of the composition to lubricate the crankcase of an internal combustion engine are disclosed. The additives are prepared by hydroperoxidizing ethylene copolymers and terpolymers.
    Type: Grant
    Filed: October 21, 1982
    Date of Patent: May 15, 1990
    Assignee: Chevron Research Company
    Inventor: Jeffrey E. Stemke
  • Hydroperoxidized ethylene copolymers and terpolymers as dispersants and V. I. improvers
    Patent number: 4891146
    Abstract: Lubricating oil compositions containing multifunctional additives, e.g. sludge dispersants and V.I. improvers, and the use of the composition to lubricate the crankcase of an internal combustion engine are disclosed. The additives are prepared by hydroperoxidizing ethylene copolymers and terpolymers.
    Type: Grant
    Filed: January 26, 1988
    Date of Patent: January 2, 1990
    Assignee: Chevron Research Company
    Inventor: Jeffrey E. Stemke
  • Grease composition
    Patent number: 4661276
    Abstract: Disclosed is a polyurea-thickened grease containing a polymeric material which improves the low shear stability of the grease.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: April 28, 1987
    Assignee: Chevron Research Company
    Inventor: Jeffrey E. Stemke
  • Grease composition with improved low shear stability
    Patent number: 4436649
    Abstract: Disclosed is a polyurea-thickened grease containing a polyhydroxylated compound which improves the low shear stability of the grease.
    Type: Grant
    Filed: June 30, 1982
    Date of Patent: March 13, 1984
    Assignee: Chevron Research Company
    Inventor: Jeffrey E. Stemke