Patents by Inventor David Arthur Pierce

David Arthur Pierce 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).

  • Polymerization process
    Publication number: 20070293650
    Abstract: A process for preparing a polymer comprising introducing a chain extending compound with a reactive compound into a first mixer; forming a homogenous mixture in the first mixer; transporting the homogenous mixture through at least one of a pipe reactor and a static mixer bed; delivering the homogenous mixture to a second mixer selected from a rotating arc mixer and a high viscosity mixer; and reacting the homogenous mixture with a capping agent in the second mixer.
    Type: Application
    Filed: May 1, 2007
    Publication date: December 20, 2007
    Inventors: Vere Orland Archibald, David Arthur Pierce
  • Process for preparing emulsion polymers
    Publication number: 20040143053
    Abstract: A method of preparing an emulsion polymer having a low residual monomer content, wherein the method includes the simultaneous addition of an oxidizing agent and a reducing agent to different locations on the process side of a heat exchanger is provided.
    Type: Application
    Filed: January 7, 2004
    Publication date: July 22, 2004
    Inventors: Richard Shu-Hua Wu, David Arthur Pierce, Owen Clifford Hallerud
  • Process for preparing continuously variable-composition copolymers
    Patent number: 6140431
    Abstract: A process for the preparation of continuously variable-composition copolymers by effecting gradual changes in monomer composition during the polymerization is disclosed. Poly(meth)acrylate copolymers made by the process of the present invention have improved lubricating oil additive properties, for example, as pour point depressants, when compared to related polymer additives made by conventional means.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: October 31, 2000
    Assignee: Rohm and Haas Company
    Inventors: Bernard George Kinker, Joseph Martin Bollinger, Robert Howard Gore, David Arthur Pierce