Patents by Inventor Helmut Pfitzner

Helmut Pfitzner 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 production of iron complexes of tetraazaannulenes
    Patent number: 3936445
    Abstract: Process for the production of iron complexes of tetraazaannulenes starting from isoxazole, o-phenylene diamines and iron compounds. The process yields the iron complexes in good yields and a state of high catalytic activity for oxidation processes.
    Type: Grant
    Filed: March 14, 1974
    Date of Patent: February 3, 1976
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Helmut Pfitzner, Walter Dammert