Patents by Inventor Donald T. Robertson

Donald T. Robertson 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).

  • Process for sulfonating internal olefins
    Patent number: 5488148
    Abstract: A process for sulfonating internal olefins wherein a dilute solution of the internal olefins in an inert hydrocarbon solvent is sulfonated to produce a reaction mixture containing intermediate sulfonated compounds, the intermediate sulfonated compounds in the reaction mixture being neutralized under conditions to form neutralized sulfonated compounds, the neutralized sulfonated compounds in the reaction mixture being hydrolyzed to form a product mixture containing hydroxy alkane sulfonates and alkene sulfonates that are then recovered.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: January 30, 1996
    Assignee: Vista Chemical Company
    Inventors: Upali Weerasooriya, John Lin, K. Lee Matheson, Donald T. Robertson, Janet L. Watson, LeAnn M. Rowe
  • Process for alkoxylation of esters and products produced therefrom
    Patent number: 5386045
    Abstract: A process for producing alkoxylated mono-, di-, and tri-esters in which a starting material ester and an alkylene oxide are reacted in the presence of selected calcium based catalysts.
    Type: Grant
    Filed: August 5, 1992
    Date of Patent: January 31, 1995
    Assignee: Vista Chemical Company
    Inventors: Upali Weerasooriya, Donald T. Robertson, John Lin, Bruce E. Leach, Cynthia L. Aeschbacher, Tonyette S. Sandoval
  • Process for alkoxylation of esters and products produced therefrom
    Patent number: 5220046
    Abstract: A process for producing alkoxylated methyl esters to produce a narrow homolog distribution of the alkoxylate species in which a staring material methyl ester and an alkylene oxide are reacted in the presence of selected calcium based catalysts.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: June 15, 1993
    Assignee: Vista Chemical Company
    Inventors: Bruce E. Leach, John Lin, Cynthia L. Aeschbacher, Donald T. Robertson, Tonyette S. Sandoval, Upali Weerasooriya