Patents by Inventor Dan A. Asperger

Dan A. Asperger 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).

  • Method of preparing polyurethane foam carpet underlay having a barrier film attached thereto
    Patent number: 4336089
    Abstract: A polyurethane carpet underlay having a barrier film attached to one side is prepared employing a continuous sheet of film material which serves both as the mold for the polyurethane-forming mixture and the barrier film.
    Type: Grant
    Filed: March 30, 1981
    Date of Patent: June 22, 1982
    Assignee: The Dow Chemical Company
    Inventor: Dan A. Asperger