Patents by Inventor Hans Jakob Peterli

Hans Jakob Peterli 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 coupling of water-insoluble 2,4-disubstituted phenols with diazotized o-nitroanilines
    Patent number: 3998804
    Abstract: Substituted 2-nitro-2'-hydroxy-azobenzenes are manufactured by coupling a phenol dispersed with a dispersing agent in water with a solution, in an inorganic acid, of a diazotized o-nitroaniline at a pH value not exceeding 2.The azobenzenes obtained are intermediate products for benztriazoles.
    Type: Grant
    Filed: May 6, 1975
    Date of Patent: December 21, 1976
    Assignee: Ciba-Geigy Corporation
    Inventors: Jean Rody, Alain Claude Rochat, Hans Jakob Peterli, Robert Albrecht