Patents by Inventor William J. Van Westrenen

William J. Van Westrenen 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).

  • Vinyl ester copolymer latices and their preparation
    Patent number: 3969296
    Abstract: The preparation of vinyl ester copolymers is described. More particularly, vinyl ester copolymer latices are described which exhibit improved scrub resistance when applied to existing paint films.
    Type: Grant
    Filed: February 18, 1975
    Date of Patent: July 13, 1976
    Assignee: Shell Oil Company
    Inventors: Teunis C. Wassenburg, William J. Van Westrenen
  • Bulk copolymerization of vinyl ester
    Patent number: 3956245
    Abstract: A process for the production of co- and multi-monomer random polymers involves the free-radical bulk polymerization of vinyl esters and styrene while controlling the rate of polymerization via the gradual addition of styrene to the polymerization medium during polymerization.
    Type: Grant
    Filed: April 23, 1974
    Date of Patent: May 11, 1976
    Assignee: Shell Oil Company
    Inventors: Adrianus M. C. Van Steenis, William J. Van Westrenen