Patents by Inventor Donald G. Zelhart

Donald G. Zelhart 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).

  • Fatty alkly diethanolamines to stabilize the optical clarity of polyols containing zinc fatty acid salts
    Patent number: 5741865
    Abstract: The tendency to opacify of a polyol composition comprising one or more zinc fatty acid salts such as zinc stearate, added to form a mold release agent when the polyol is converted to a molded polyurethane article, is retarded by the presence of a small but effective amount of one or more fatty alkyl diethoxylate (e.g. diethanolamine) compounds.
    Type: Grant
    Filed: July 18, 1995
    Date of Patent: April 21, 1998
    Assignee: Witco Corporation
    Inventors: Charles R. Bunting, Donald G. Zelhart