Patents by Inventor John R. Fritsch

John R. Fritsch 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).

  • Functionalized tris(hydroxyphenyl) compounds
    Patent number: 5438142
    Abstract: Compounds useful as polymer stabilizers which are polymerizable into condensation polymer systems are disclosed and claimed. A particularly preferred embodiment is 1-(3'-(benzotriazol-2"-yl)-4'-hydroxyphenyl)-1,1-bis(4-hydroxyphenyl)ethan e.
    Type: Grant
    Filed: August 10, 1993
    Date of Patent: August 1, 1995
    Assignee: Hoechst Celanese Corp.
    Inventors: John R. Fritsch, Olan S. Fruchey, Debasish Kuila, George Kvakovszky, Mark A. Murphy, Michael T. Sheehan, James R Sounik, Richard Vicari