Patents by Inventor Frank E. Critchfeld

Frank E. Critchfeld 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).

  • Soft, low density flexible polyurethane foam
    Patent number: 5500452
    Abstract: A flexible polyurethane foam formulation comprising a first polyol, a second polyol, an unhindered primary diamine or its corresponding carbamate, a diol, water, at least one catalyst, a foam stabilizer and isocyanate is disclosed. No auxiliary blowing agent is required. The resulting soft foams have densities of less than about 2 pcf and 25% IFD values of less than about 10 pounds/50 sq. inches.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: March 19, 1996
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Otis M. Baker, Jr., Frank E. Critchfeld, Paul M. Westfall