Patents by Inventor Heinz Karl Hofmeister

Heinz Karl Hofmeister 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 the preparation of amidosulfonic acid
    Patent number: 4107279
    Abstract: When sulfur trioxide is reacted with ammonia, a melted reaction product containing mainly the ammonium salts of amidosulfonic acid and imido-disulfonic acid is obtained. According to the invention the melted reaction product is introduced into mineral acids. From the resulting solution, free amidosulfonic acid precipitates in high yield.
    Type: Grant
    Filed: August 22, 1977
    Date of Patent: August 15, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Reinhold Graser, Heinz Karl Hofmeister, Adolf Metzger