Patents by Inventor Ludwig Pentzel

Ludwig Pentzel 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).

  • Melamine, formaldehyde, thiourea and diol ether thermosetting resin and method of preparing the same
    Patent number: 3933755
    Abstract: A thermosetting resin useful for attaching decorative paper facings to chipboard and like cellulosic panels is prepared by condensation of melamine with thiourea, formaldehyde, and a diol ether, up to one half by weight of the melamine being capable of being replaced by urea without seriously effecting the quality of the resin.
    Type: Grant
    Filed: May 22, 1974
    Date of Patent: January 20, 1976
    Assignee: Suddeutsche Kalkstickstoff-Werke AG
    Inventors: Horst Michaud, Josef Seeholzer, Ludwig Pentzel, Josefa Mangs