Patents by Inventor Bernhard Liessem

Bernhard Liessem 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).

  • Foam manufacture
    Patent number: 4417002
    Abstract: A carboxylic acid or carboxylate is reacted with an isocyanate to produce gas which is used to give a blowing action in the manufacture of a foam plastics material, especially foam polyurethane.Preferably formic acid or a formate is used.
    Type: Grant
    Filed: July 7, 1982
    Date of Patent: November 22, 1983
    Assignee: Kabel-und-Gummiwerke AG
    Inventor: Bernhard Liessem