Patents by Inventor Hartmuth Wilhelm Alt, deceased

Hartmuth Wilhelm Alt, deceased 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 manufacture of phenylhydrazine
    Patent number: 3930968
    Abstract: A process for the manufacture of phenylhydrazine by cathodic reduction of diazoaminobenzene dissolved in an electrolyte on solid electrodes with separation of cathode and anode spaces by a diaphragm wherein the diazoaminobenzene solution is electrolyzed in a flow type diaphragm cell at a graphite cathode having a three dimensional surface.
    Type: Grant
    Filed: February 1, 1974
    Date of Patent: January 6, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Jurgen Cramer, Hartmuth Wilhelm Alt, deceased, by Ortwin Franz Felix Alt, heir, by Gudrun Anneliese Beyer, nee Alt, heir