Patents by Inventor John R. Parsonage

John R. Parsonage 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).

  • Flame retardant polyurethane foams
    Patent number: 5250580
    Abstract: A polyurethane foam contains, as a fire retardant, water-soluble silicate particles in an amount of at least 30 parts per 100 parts by weight of the polyol of the polyurethane, which silicate particles have an average size of at least 62 microns.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: October 5, 1993
    Assignee: Unilever Patent Holdings B.V.
    Inventors: John R. Parsonage, EDwin Metcalfe