Patents by Inventor Bruce E. Wilburn

Bruce E. Wilburn 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).

  • Stable petroleum resin-water emulsion
    Patent number: 5412007
    Abstract: A stable composition for suppressing dust which comprises 0.1 to 35 parts by weight of a water-soluble lignosulfonate anionic surfactant, 0.1 to 35 parts by weight of one or more non-ionic surfactants, 5 to 85 parts by weight of a petroleum resin, and 1 to 99 parts by weight of water.
    Type: Grant
    Filed: February 4, 1994
    Date of Patent: May 2, 1995
    Assignee: Pennzoil Products Company
    Inventors: Randall R. Hendrix, Bruce E. Wilburn, Aidan P. Cooney
  • Olefin polymer pour point depressants
    Patent number: 5188724
    Abstract: A pour point depressant for lubricating oils comprises an olefin copolymer which contains alkyl side chains having carbon atoms, wherein the average side chain length in the copolymer is 10.5 to 12.0.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: February 23, 1993
    Assignee: Pennzoil Products Company
    Inventors: William J. Heilman, Bruce E. Wilburn
  • Methacrylate pour point depressants and compositions
    Patent number: 4956111
    Abstract: A pour point depressant for lubricating oils comprises a poly(methacrylate) polymer having the repeating unit ##STR1## wherein R is an alkyl group having an average chain length in the polymer of 12.6 to 13.8, and n is an integer indicating the number of repeating units, the value of n being sufficient to provide a molecular weight of 10,000 to 300,000 for the polymer, the pour point depressant having the capacity to reduce the stable pour point to -35.degree. C., while being compatible with other additives such as viscosity index improvers and detergents.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: September 11, 1990
    Assignee: Pennzoil Products Company
    Inventors: Bruce E. Wilburn, William J. Heilman
  • Methacrylate pour point depressants and compositions
    Patent number: 4844829
    Abstract: A pour point depressant for lubricating oils comprises a poly(methacrylate) polymer having the repeating unit ##STR1## wherein R is an alkyl group having an average chain length in the polymer of 12.6 to 13.0, and n is an integer indicating the number of repeating units, the value of n being sufficient to provide a molecular weight of 10,000 to 300,000 for the polymer, the pour point depressant having the capacity to reduce the stable pour point to -35.degree. C., while being compatible with other additives such as viscosity index improvers.
    Type: Grant
    Filed: October 13, 1988
    Date of Patent: July 4, 1989
    Assignee: Pennzoil Products Company
    Inventors: Bruce E. Wilburn, William J. Heilman