Patents by Inventor William P. Nelson

William P. Nelson 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 propylene oxide by cosolvent extractive distillation
    Patent number: 5340446
    Abstract: An extractive distillation agent consisting essentially of a mixture of triethylene glycol with a lower boiling cosolvent selected from the group consisting of 2-methyl-2,4-pentanediol, tertiary butyl alcohol and ethylene glycol is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the extractive distillation agent, water and acetone and some of the methanol introduced into the distillation column.
    Type: Grant
    Filed: October 23, 1992
    Date of Patent: August 23, 1994
    Assignee: Texaco Chemical Company
    Inventors: William P. Nelson, William A. Smith
  • Mounting plaque
    Patent number: D343373
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: January 18, 1994
    Inventor: William P. Nelson