Patents by Inventor Josef A. Thomas

Josef A. Thomas 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 recovery of ortho-phenylphenol
    Patent number: 3997615
    Abstract: A process for purifying ortho-phenylphenol which is admixed with ortho-cyclohexylphenol, by treating the mixture with an alkaline solution containing less than one mole equivalent of base per mole of ortho-phenylphenol in said mixture; the alkaline solution is extracted and ortho-phenylphenol is recovered from the aqueous phase by acificiation and extraction with subsequent isolation of the ortho-phenylphenol, which contains less than 5% (by weight) ortho-cyclohexylphenol.
    Type: Grant
    Filed: May 20, 1975
    Date of Patent: December 14, 1976
    Assignee: Stamicarbon B.V.
    Inventors: Joseph F. M. Klein, Petrus A. M. J. Stijfs, Josef A. Thomas