Patents by Inventor Siegmund Frick

Siegmund Frick 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).

  • Polyvinylchloride polymer inhibited against release of hydrogen chloride at elevated temperature
    Patent number: 3966673
    Abstract: Polyvinylchloride inhibited against release of hydrogen chloride at elevated temperature is produced by polymerizing vinyl chloride in a reaction medium having finely divided calcium carbonate dispersed therein.
    Type: Grant
    Filed: July 13, 1973
    Date of Patent: June 29, 1976
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Siegmund Frick, Wilhelm Gresser, Gunther Meyer, Gerhard Bier