Patents by Inventor T. Robert Hopkins

T. Robert Hopkins 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).

  • Graft copolymers prepared from solvent-free reactions and dispersant derivatives thereof
    Patent number: 5429758
    Abstract: Compositions useful as oil additives are prepared in a solvent or a solvent free system by reacting (B) an unsaturated carboxylic acid reagent with (A) a hydrogenated block copolymer in the presence of (C) free radical initiators. The formed reaction product (D) can be further reacted with a (E) primary amine-containing compound in a solvent or a solvent free system.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: July 4, 1995
    Assignee: The Lubrizol Corporation
    Inventors: Katsumi Hayashi, T. Robert Hopkins, Curtis R. Scharf
  • Oil-soluble reaction products of an acylated reaction product, a polyamine, and mono-functional acid
    Patent number: 4670173
    Abstract: Oil-soluble compositions, useful as dispersant viscosity modifiers, are formed by the reaction product of an acylating product (D) a (F) polyamine, and a (G) mono-functional acid. The compositions can be prepared in solvent such as a hydrocarbon oil or in the absence of a solvent.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: June 2, 1987
    Assignee: The Lubrizol Corporation
    Inventors: Katsumi Hayashi, T. Robert Hopkins, Curtis R. Scharf