Patents by Inventor Douglas N. Sharp

Douglas N. Sharp 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).

  • Purification of isothiazolones
    Patent number: 5008395
    Abstract: A process for obtaining pure 2-substituted-3(2H)-isothiazolones is presented, wherein the substituent is alkyl, linear or branched. By developing suitable conditions, the isothiazolone hydrochloride is isolated from the complex reaction media wherein it is formed as readily filterable crystals of high purity. Such purified crystals are then utilized in isolation of isothiazolone of high purity.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: April 16, 1991
    Assignee: Rohm and Haas Company
    Inventors: Ramesh B. Petigara, Douglas N. Sharp