Patents by Inventor Hugo Kesselman

Hugo Kesselman 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 the preparation of pure 4,4'-dihydroxybiphenyl
    Patent number: 5196605
    Abstract: In a process for the preparation of 4,4'-dihydroxybiphenyl of high purity 4,4'-dibromobiphenyl is hydrolized in the presence of a copper compound catalyst, the insoluble materials comprising the catalyst is filtered off from the product mixture, 4,4'-dihydroxybiphenyl is precipitated by adjusting the pH and crude 4,4'-dihydroxybiphenyl separated from the product mixture is fractionally distilled to obtain substantially pure 4,4'-dihydroxybiphenyl.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: March 23, 1993
    Assignee: Bromine Compounds, Ltd.
    Inventors: Jakob Oren, Hugo Kesselman, Joshua Hermolin