Patents by Inventor Robert Kufrin

Robert Kufrin 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).

  • Polyester resins for polyurethane foams
    Patent number: 4404295
    Abstract: The machine processing character as well as the stress-strain properties of polyester polyurethane foam are improved by the use of a cross-linking polyol, a viscosity increasing dicarboxylic acid or anhydride such as phthalic anhydride, and by the use of specific minor amounts of poly(oxyethylene) glycol, in the esterification formula of foam grade polyester resins. A nonhydrophillic flexible polyester based polyurethane foam is produced.
    Type: Grant
    Filed: July 14, 1982
    Date of Patent: September 13, 1983
    Assignee: Witco Chemical Corporation
    Inventors: Carl Bernstein, James Stogis, Travis Riddle, Robert Kufrin
  • Polyester resins for polyurethane foams prepared by reacting two diacids, diethylene glycol, a poly(oxyethylene) glycol and a cross-linking polyol
    Patent number: 4349662
    Abstract: The machine processing character as well as the stress-strain properties of polyester polyurethane foam are improved by the use of a cross-linking polyol, a viscosity increasing dicarboxylic acid or anhydride such as phthalic anhydride, and by the use of specific minor amounts of poly(oxyethylene) glycol, in the esterification formula of foam grade polyester resins. A nonhydrophillic flexible polyester based polyurethane foam is produced.
    Type: Grant
    Filed: May 13, 1981
    Date of Patent: September 14, 1982
    Assignee: Witco Chemical Corporation
    Inventors: Carl Bernstein, James Stogis, Travis Riddle, Robert Kufrin