Patents by Inventor Eva M. Kohn

Eva M. Kohn 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).

  • Styrylaryloxy ether sulfonates, a process for their preparation and their use in the recovery of crude oil
    Patent number: 4842776
    Abstract: Styrylaryloxy ether sulfonates of the formula ##STR1## in which either R.sub.1 denotes styryl and simultaneously R.sub.2 and R.sub.3 are identical or different and denote hydrogen or styryl, or R.sub.1 and R.sub.2 are nonidentical and each denote methyl or styryl and simultaneously R.sub.3 denotes hydrogen or styryl, x denotes a number from 2 to 20, and M denotes an ammonium or alkali metal cation. These compounds are suitable as surfactant auxiliaries in oil recovery.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: June 27, 1989
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Schmidt, Walter Rupp, Gerhart Schneider, Eva M. Kohn