Patents by Inventor Donald J. Clarke

Donald J. Clarke 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 a Mannich base
    Patent number: 4877834
    Abstract: A lubricating oil contains a carbon-carbon backbone polymer containing residual unsaturation and bearing graft moieties derived from graft monomers containing ethylenic unsaturation and an epoxide moiety, and bonded to at least one of said graft moieties through an opened epoxide moiety, a Mannich base, prepared by reaction of an amine, an aldehyde, and a hindered phenol containing an active hydrogen atom.
    Type: Grant
    Filed: May 6, 1988
    Date of Patent: October 31, 1989
    Assignee: Texaco Inc.
    Inventors: Christopher S. Liu, Donald J. Clarke, Larry D. Grina
  • Lubricating oil containing a mannich base
    Patent number: 4780230
    Abstract: A lubricating oil contains a carbon-carbon backbone polymer containing residual unsaturation and bearing graft moieties derived from graft monomers containing ethylenic unsaturation and an epoxide moiety, and bonded to at least one of said graft moieties through an opened epoxide moiety, a Mannich base, prepared by reaction of an amine, an aldehyde, and a hindered phenol containing an active hydrogen atom.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: October 25, 1988
    Assignee: Texaco Inc.
    Inventors: Christopher S. Liu, Donald J. Clarke, Larry D. Grina