Patents by Inventor Wolfgang Gerhard Glasser

Wolfgang Gerhard Glasser 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).

  • Polyurethane intermediates and products and methods of producing same from lignin
    Patent number: 4017474
    Abstract: Polycarboxy-oxyalkylene polyester-ether polyol intermediates useful in the production of polyurethane products and methods of making the intermediates and polyurethane products are described. The polyol intermediates are made from lignin by reacting lignin with maleic anhydride, substituted maleic anhydride, or mixtures thereof to form carboxylated lignin maleic anhydride copolymers. These copolymers are then reacted with an oxyalkylating medium with or without prior hydrolysis to form the polyol intermediates. These polyester-ether polyol intermediates are then reacted with an isocyanate medium having an isocyanate with at least 2 NC0 groups per molecule to produce polyurethane products with or without simultaneous foaming.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: April 12, 1977
    Assignee: Research Corporation
    Inventors: Wolfgang Gerhard Glasser, Oscar Hsien-Hsiang Hsu