Patents by Inventor Fritz Fleck

Fritz Fleck 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).

  • Pyrazoline derivatives
    Patent number: 3939154
    Abstract: The invention relates to optical brightening agents.
    Type: Grant
    Filed: January 24, 1974
    Date of Patent: February 17, 1976
    Assignee: Sandoz Ltd., (Sandoz AG)
    Inventors: Ivan Joseph Bolton, Fritz Fleck, Alec Victor Mercer