Patents by Inventor Henry A. Karrfalt

Henry A. Karrfalt 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).

  • Roofing systems and insulation attachment method
    Patent number: 4996803
    Abstract: A roofing system and method of securing insulation board to a roof deck free of mechanical fasteners includes the deck, a plurality of the insulation boards, and a flexible waterproof membrane which covers the boards. First and second embodiments of the invention include flexible polyisobutylene pads and strips respectively, which have opposite top and bottom pressure sensitive adhesive surfaces. A plurality of the pads are adhered to the insulation boards by their adhesive top surface at locations where mechanical fasteners otherwise would be necessary to secure the boards to the roof deck. A pair of the strips are adhered to the boards by their adhesive top surface at spaced locations. After removal of a release sheet from the bottom surface of the pads or strips, the boards are placed and pressed on the roof deck, and the exposed adhesive secures the boards to the deck free of mechanical fasteners.
    Type: Grant
    Filed: August 10, 1989
    Date of Patent: March 5, 1991
    Assignee: Bridgestone/Firestone, Inc.
    Inventors: Henry A. Karrfalt, Mark R. Easter