Patents by Inventor Herbert E. Zimmerman

Herbert E. Zimmerman 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).

  • Fire resistant asbestos-free door, panel or building elements, and method of manufacture using unique compositions
    Patent number: 4075804
    Abstract: A fire resistant door, panel or building element is manufactured from unique compositions which are free of asbestos, thereby minimizing the health hazards associated with the manufacture of conventional asbestos-containing fireproof doors, panels or building elements. In essence, the compositions comprise calcium silicates, vermiculite, sisal fibers and fiberglass.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: February 28, 1978
    Assignee: Champion International Corporation
    Inventor: Herbert E. Zimmerman