Patents by Inventor Marshall T. Purvis

Marshall T. Purvis 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).

  • Single stage continuous graft polymerization process and product
    Patent number: 4230833
    Abstract: A continuous, single stage process for grafting methyl methacrylate polymer or copolymer onto a synthetic rubber, and the resultant graft polymers which have a dispersed rubber phase in a continuous hard phase are disclosed.
    Type: Grant
    Filed: February 8, 1979
    Date of Patent: October 28, 1980
    Assignee: Rohm and Haas Company
    Inventor: Marshall T. Purvis
  • Modifiers for PVC foam, process for extruding modified PVC foam and modified PVC foam compositions
    Patent number: 4120833
    Abstract: A modifier system for extruding PVC foam comprising two separate core-shell polymers, the shells of which are substantially ungrafted to the cores. Also disclosed is an improved process for extruding PVC foam and improved extruded PVC foam composition and articles.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: October 17, 1978
    Assignee: Rohm and Haas Company
    Inventors: Marshall T. Purvis, R. Peter Grant
  • Acrylic modified foamed nylon product and process
    Patent number: 4070426
    Abstract: A method of making nylon (polycarbonamide) foam involving the use of a multi-phase carboxylic acid-containing polymer which reacts with the amine groups of the nylon to produce water which blows the foam during the process.
    Type: Grant
    Filed: March 22, 1977
    Date of Patent: January 24, 1978
    Assignee: Rohm and Haas Company
    Inventor: Marshall T. Purvis
  • Modifiers for PVC foam, process for extruding modified PVC foam and modified PVC foam compositions
    Patent number: 3983296
    Abstract: A modifier system for extruding PVC foam comprising two separate core-shell polymers, the shells of which are substantially ungrafted to the cores. Also disclosed is an improved process for extruding PVC foam and improved extruded PVC foam composition and articles.
    Type: Grant
    Filed: March 22, 1974
    Date of Patent: September 28, 1976
    Assignee: Rohm and Haas Company
    Inventors: Marshall T. Purvis, R. Peter Grant