Patents by Inventor Frederick S. Dmuchowski

Frederick S. Dmuchowski 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).

  • High temperature expansion joint
    Patent number: 4140338
    Abstract: An expansion joint for duct work is disclosed, which comprises a pair of frames, spacer means extending outwardly from said frames, and a boot. The boot has five layers: an inner asbestos/aluminum/silica material, a fibrous insulation batt, a middle asbestos/aluminum material, a vapor barrier, and an outer asbestos/fluoroelastomer material.
    Type: Grant
    Filed: May 26, 1977
    Date of Patent: February 20, 1979
    Assignee: Johns-Manville Corporation
    Inventors: John Kazmierski, Jr., Craig E. Thornton, John L. Ambrose, Frederick S. Dmuchowski