Patents by Inventor Christian M. Lehmann

Christian M. Lehmann 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).

  • Process for making low density flexible polyisocyanurate-polyurethane foams
    Patent number: 4981880
    Abstract: Low density flexible molded and slabstock foams are prepared by reacting a polyisocyanate with a polyol composition containing a mono-alcohol. The blowing of the foam is essentially with carbon dioxide generated from the reaction of water with isocyanate, and the reaction catalysts used in the preparation of the foam include a polyisocyanate trimerization catalyst.
    Type: Grant
    Filed: January 24, 1990
    Date of Patent: January 1, 1991
    Assignee: The Dow Chemical Company
    Inventors: Christian M. Lehmann, Michael A. P. Gansow