Patents by Inventor Hans Stapf

Hans Stapf 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).

  • Process for preparing technically pure acetic acid by extractive distillation
    Patent number: 3951755
    Abstract: Process for preparing technically pure acetic acid from water - acetic acid mixtures by extractive distillation with N-methyl acetamide.
    Type: Grant
    Filed: February 18, 1975
    Date of Patent: April 20, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Rudolf Sartorius, Hans Stapf