Patents by Inventor Milton Freifeld

Milton Freifeld 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).

  • Cellular vinyl halide resin compositions and a process for their production
    Patent number: 3986989
    Abstract: Cellular vinyl halide resin compositions are prepared by adding to a vinyl halide resin plastisol a chemical blowing agent, such as azodicarbonamide, and an activator for the blowing agent that contains a zinc salt and a strontium salt and heating the resulting composition at a temperature at which the blowing agent will decompose and the vinyl halide resin will fuse.
    Type: Grant
    Filed: August 28, 1974
    Date of Patent: October 19, 1976
    Assignee: Tenneco Chemicals, Inc.
    Inventors: Milton Freifeld, Robert E. Lally