Patents by Inventor William R. Proops

William R. Proops 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).

  • Lead-free sprayable polyurethane system and rigid cellular products
    Patent number: 3984360
    Abstract: A lead-free rigid polyurethane foam which cures rapidly at low temperatures and which comprises an organic isocyanate, a polyol, a catalyst, a foaming agent, a cell-size regulator and a primary polyoxyalkylene amine.
    Type: Grant
    Filed: November 12, 1974
    Date of Patent: October 5, 1976
    Assignee: Witco Chemical Corporation
    Inventors: Dennis E. Galbreath, William R. Proops