Patents by Inventor Astrid Schumacher

Astrid Schumacher 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).

  • Surface-active hydroxysulfonates
    Patent number: 4865774
    Abstract: Aqueous solutions of surface-active hydroxysulfonates are obtained by reaction of unsaturated fatty alkenyl or fatty alkenyl polyalkoxyl esters, for example of oleyl acetate or oleyl polyethoxyl acetate, with sulfur trioxide, introduction of the reaction product into aqueous alkali metal, alkaline-earth or ammonium hydroxide and heating of the solutions until the ester and sultone groups present have been hydrolyzed.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: September 12, 1989
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Bernd Fabry, Robert Piorr, Astrid Schumacher