Patents by Inventor Claude Charles Shauber

Claude Charles Shauber 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).

  • Process for making a viscosity index improving copolymer
    Patent number: 6228819
    Abstract: A method for making viscosity index improving copolymer includes polymerizing a monomer mixture including a first (meth)acrylate monomer, a second (meth)acrylate monomer and a styrenic monomer in an oil soluble diluent and in the presence of a polymerization initiator to form a polymerization intermediate and then polymerizing an additional amount of the first (meth)acrylate monomer, the second (meth)acrylate monomer or a mixture thereof in the presence of the polymerization intermediate to provide a solution of a viscosity index improving copolymer in the diluent wherein the solution includes less than or equal to 1000 parts by weight residual styrene monomer per one million parts by weight solution.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: May 8, 2001
    Assignee: Rohm and Haas Company
    Inventor: Claude Charles Shauber