Patents by Inventor Rex L. Robsein

Rex L. Robsein 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 halogenated aromatic sulfones or ketones
    Patent number: 5260489
    Abstract: A process for purifying a halogenated aromatic sulfone or ketone compound comprises contacting the compound with a mixture containing a solvent having a normal boiling point less than about 225.degree. C. and water to form a second mixture, heating the second mixture at a temperature sufficient to substantially dissolve the halogenated compound to form a third mixture, cooling the third mixture to purify and recrystallize the compound, and recovering the purified, recrystallized compound. A second embodiment of the invention comprises repeating the purification process steps at least once to further purify the halogenated aromatic sulfone or ketone compound.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: November 9, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Rex L. Robsein, Jimmie J. Straw, Darryl R. Fahey