Patents by Inventor Wallace D. Johnson

Wallace D. Johnson 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).

  • Preparation of impact plastic compositions
    Patent number: 3935136
    Abstract: High impact plastic compositions are prepared by dissolving an unsaturated elastomer in a vinylidene group-containing monomer or monomers, polymerizing in a suspension polymerization system, and subsequently cross-linking the product in a hot-mixing step employing a peroxide.
    Type: Grant
    Filed: February 7, 1972
    Date of Patent: January 27, 1976
    Assignee: Phillips Petroleum Company
    Inventors: Clifford W. Childers, Earl Clark, Wallace D. Johnson