Patents by Inventor Vishnu R. Ranade

Vishnu R. Ranade 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).

  • Method for making tris(hydroxyphenyl) compounds using ion exchange resins
    Patent number: 5969167
    Abstract: An improved method for the preparation of tris(4-hydroxyphenyl) compounds is provided. In particular, an improved method for preparing 1, 1, 1-tris(4'-hydroxyphenyl)ethane is provided which comprises heating a mixture comprising phenol and 4-hydroxy acetophenone in the presence of effective amounts of an ion exchange catalyst and a mercaptan as a copromoter such that the resulting 1, 1, 1-tris(4'-hydroxyphenyl)ethane is substantially free of various reaction impurities.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: October 19, 1999
    Assignee: General Electric Company
    Inventors: Swaminathan Sivaram, Vishnu R. Ranade, Srinivasan Chakrapani, Prakash P. Wadgonkar, Paul D. Sybert, Gaylord M. Kissinger, Ashok K. Mendiratta