Patents by Inventor Manfred Giersig

Manfred Giersig 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).

  • Polyester polyols, a process for their production and their use in the isocyanate polyaddition process
    Patent number: 4681903
    Abstract: Polyester polyols corresponding to the formula ##STR1## in which R.sub.1, Z, x, A.sub.1, A.sub.2, A.sub.3, A.sub.4, A.sub.5, A.sub.6, A.sub.7 and A.sub.8 each represent specified groups or values are made by reacting (a) a dicarboxylic acid or derivative thereof or anhydride thereof with (b) a tris-alkanolamine and/or tetrakis-alkanol diamine. These polyester polyols are particularly useful in the production of polyurethane and polyisocyanurate foams.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: July 21, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Haas, Hans-Ulrich Weber, Claus-Dieter Sommerfeld, Manfred Giersig, Rolf Wiedermann