Patents by Inventor Robert A. Heimsch

Robert A. Heimsch 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).

  • Refining olefin/maleic acid copolymers by extraction with alkanes
    Patent number: 4293668
    Abstract: Olefin/maleic acid copolymer is refined to pharmaceutical quality by extraction of contaminants with hexane or heptane.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: October 6, 1981
    Assignee: Monsanto Company
    Inventor: Robert A. Heimsch
  • Preparation of refined olefin/maleic acid copolymers
    Patent number: 4166900
    Abstract: Olefin/maleic acid copolymer is refined to pharmaceutical quality by use of dichloroethane to remove contaminants, as by precipitating from solution with dichloroethane.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: September 4, 1979
    Assignee: Monsanto Company
    Inventors: Robert A. Heimsch, John H. Johnson
  • Multi-color laminate of photopolymer that is image-wise hydroperoxidized
    Patent number: 3993489
    Abstract: This invention relates to light sensitive compositions comprising a photosensitizer and a substrate useful in preparing photographic images.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: November 23, 1976
    Assignee: Monsanto Company
    Inventors: Robert A. Heimsch, Eric T. Reaville