Patents by Inventor P. H. Quednau

P. 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: 5399294
    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 a mixture from B.sub.1 monohydroxyl compounds and B.sub.2 monohydroxy-, monocarboxylic acid compounds, or monoamino-, monocarboxylic acid compounds andC 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 about 30-70% with C,and the preparation of such dispersing agents.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: March 21, 1995
    Assignee: EFKA-Chemicals B.V.
    Inventor: P. H. Quednau