Patents by Inventor Douglas J. Little

Douglas J. Little 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).

  • Recrystallization of bisphenol A by azeotropically drying the solvent
    Patent number: 4638102
    Abstract: This invention discloses a high yield azeotropic separation procedure for isomers of bisphenol A. Specifically, the o,p'-isomer is separated from the p,p'-isomer by removal of a cosolvent thus producing crystallization. Water and an organic solvent not miscible with water are used as cosolvents.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: January 20, 1987
    Assignee: The Dow Chemical Company
    Inventor: Douglas J. Little