Patents by Inventor Philip P. Rathke

Philip P. Rathke 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).

  • Polymerization of vinyl chloride
    Patent number: 4005249
    Abstract: Homopolymers and copolymers of vinyl chloride are produced in the form of a powder by a bulk polymerization process which involves a dual temperature operation. Vinyl chloride (either alone or admixed with other copolymerizable monomers) is contacted with conventional polymerization initiators in the absence of solvents or diluents at a first temperature of from about 68.degree. to about 110.degree. F until the polymerization has proceeded to 0.1 to 10% of completion and thereafter the temperature is raised to 120.degree. to 150.degree. F until the polymerization has reached the desired conversion.
    Type: Grant
    Filed: February 15, 1972
    Date of Patent: January 25, 1977
    Assignee: Owens-Illinois, Inc.
    Inventors: Harold E. Peterson, Philip P. Rathke