Patents by Inventor Gary L. Maechtle

Gary L. Maechtle 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).

  • Flexible polyurethane foam having a low flame spread index
    Patent number: 4232085
    Abstract: A flexible polyurethane foam having a low flame spread index is produced by combining polyol (preponderantly diol and/or triol) with polyisocyanate (preponderantly diisocyanate) in the presence of a foaming catalyst and a blowing agent. By combining at least 75% by weight of pentabromoethyl benzene, based upon the weight of the polyol, a flame spread index less than 150 can be achieved for the resulting foam in the ASTM test E-162-76. Significantly, polyurethane foams having a flame spread index less than 25 have been produced with this invention.
    Type: Grant
    Filed: August 14, 1979
    Date of Patent: November 4, 1980
    Assignee: Freeman Chemical Corporation
    Inventors: William L. Carlstrom, Gary L. Maechtle
  • Polyisocyanate prepolymers from scrap polyester and polyurethane foam products obtained therefrom
    Patent number: 4048104
    Abstract: Polyisocyanate prepolymers for use in preparing polyurethane products elastomers, adhesives and foams, are prepared by combining (1) organic polyisocyanate with (2) polyols which are the hydroxyl-terminated digestion products of (a) waste or scrap polyalkylene terephthalate polymers and (b) organic polyols. Polyurethane products resulting from the polyisocyanate prepolymers exhibit useful and unexpected properties.
    Type: Grant
    Filed: August 5, 1976
    Date of Patent: September 13, 1977
    Assignee: Freeman Chemical Corporation
    Inventors: Glenn R. Svoboda, John T. Suh, William L. Carlstrom, Gary L. Maechtle