Patents by Inventor Stuart Wharton

Stuart Wharton 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 5-/6-NITROFLUORESCEIN
    Publication number: 20120220787
    Abstract: A process for the preparation of a mixture of 3?,6?-dihydroxy-6-nitrospiro[2-benzofuran-3,9?-xanthene]-1-one and 3?,6?-dihydroxy-5-nitrospiro[2-benzofuran-3,9?- xanthene]-1-one comprising the steps of:- (a) reacting 4-nitrophthalic acid or 4-nitrophthalic anhydride with benzene-1,3-diol in methanesulphonic acid; (b) quenching the reaction in step (a) with a solvent to precipitate product; (c) isolating the precipitate; (d) heating the precipitate in water in order to hydrolyse any methansulphonic acid ester present.
    Type: Application
    Filed: February 10, 2010
    Publication date: August 30, 2012
    Inventors: Stuart Wharton, Tomos Huw Roberts