Patents by Inventor Peter H. Quednau

Peter H. Quednau 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).

  • Dispersing agents, their use and solids coated therewith
    Patent number: 5425900
    Abstract: The present invention relates to dispersing agents or their salts, comprisingA the reaction product of one or more polyisocyanates having an average functionality of from 2.0 to 5, withB at least a monohydroxyl compound,C at least a dicarboxylic acid compound andD a compound containing at least one basic ring nitrogen and an isocyanate-reactive group, in which of the isocyanate groups about 30-70% are reacted with B and C together and about 30-70% with D.
    Type: Grant
    Filed: June 25, 1992
    Date of Patent: June 20, 1995
    Assignee: EFKA-Chemicals B.V.
    Inventor: Peter H. Quednau