Patents by Inventor August Froelich

August Froelich 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).

  • Symmetric azo-bis-mercapto compounds
    Patent number: 4059574
    Abstract: Symmetric azo-bis-mercapto compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 are methyl or ethyl, R.sub.3 and R.sub.4 are the same or different alkylene having 1 to 4 carbon atoms, and n is 0 or 1, and a method for forming block copolymers of vinyl monomers in a two-step process employing such compounds as polymerization initiators.
    Type: Grant
    Filed: April 20, 1976
    Date of Patent: November 22, 1977
    Assignee: Rohm GmbH
    Inventors: Otto Hitzler, Horst Pennewiss, August Froelich, Gerhard Markert, Winfried Wunderlich