Patents by Inventor Robert B. Pinkerton

Robert B. Pinkerton 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).

  • Use of surfactants in phenol sulfonate dehydration
    Patent number: 5095132
    Abstract: A process for dehydrating phenol sulfonate salts by azeotropic distillation of water wherein a surfactant such as sodium dodecylbenzene sulfonate is used to prevent the salts from agglomerating and plating out on the walls of the reaction vessel.
    Type: Grant
    Filed: November 26, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Robert B. Pinkerton
  • Liquid phase oxidation
    Patent number: 4387236
    Abstract: A process of removing solids from an aqueous redox catalyst system which solids are formed in the production of furan compounds from butadiene or a butadiene derivative by heating at 180.degree.-280.degree. C. in the presence of sufficient cupric ion or oxygen to oxidize the solids. The redox catalyst system contains iodine ions, copper at an oxidation state between 1 and 2, a solubilizing agent for cuprous ion which is soluble in water and forms a water-soluble complex with cuprous ion and, at least 20 moles per liter of water the medium havine a pH of less than 2.
    Type: Grant
    Filed: March 3, 1982
    Date of Patent: June 7, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert B. Pinkerton