Patents by Inventor Michael R. Tirpak

Michael R. Tirpak 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).

  • Mineral-filled, high impact polyolefin molding compositions
    Patent number: 4133797
    Abstract: This invention relates to thermoplastic molding compositions suitable for molding or extruding articles such as thin-walled battery containers which possess high heat distortion temperatures and which also simultaneously possess excellent impact resistance at low temperature.
    Type: Grant
    Filed: August 4, 1976
    Date of Patent: January 9, 1979
    Assignee: The Richardson Company
    Inventors: Michael R. Tirpak, James J. Schouten, Charles E. Green
  • High impact polymer and process for its production
    Patent number: 4115478
    Abstract: A two step process for the production of high impact strength polymer compositions. The process includes reacting an acrylic and a vinyl aromatic with an elastomeric polymer, forming an intermediate reaction product containing acrylic and vinyl aromatic units grafted on to the elastomeric polymer backbone. Additional acrylic and vinyl aromatic are added and a final reaction product suitable for use in molding processes is produced. Preferably, both steps of the process are carried out in aqueous suspension. The product is made up of an insitu mixture of a graft polymer having elastomeric polymer backbone and a random polymer made up of units of vinyl aromatic and acrylic units.
    Type: Grant
    Filed: September 17, 1976
    Date of Patent: September 19, 1978
    Assignee: Richardson Corporation
    Inventors: Henry Alsberg, Dale W. Skalla, Michael R. Tirpak
  • Mineral filled, high impact, polyolefin molding compositions
    Patent number: 4006037
    Abstract: This invention relates to thermoplastic molding compositions suitable for molding or extruding articles such as thin-walled battery containers which possess high heat distortion temperatures and simultaneously excellent impact resistance at low temperature.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: February 1, 1977
    Assignee: The Richardson Company
    Inventors: Michael R. Tirpak, James J. Schouten, Charles E. Green