Patents by Inventor Paul S. Hale

Paul S. Hale 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).

  • Alkenyl succinic anhydrides process
    Patent number: 5021169
    Abstract: Alkenyl succinic anhydrides having a decreased amount of tar and color bodies are made by the reaction of an olefin with maleic anhydride in the presence of a tri-orthoalkylphenyl phosphite and optionally a hindered phenolic antioxidant such as 2,4,6-tri-(3,5-di-tert-butyl-4-hydroxybenzyl) mesitylene.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: June 4, 1991
    Assignee: Ethyl Corporation
    Inventors: Kju H. Shin, Paul S. Hale
  • Alkenyl succinic anhydrides process
    Patent number: 4958034
    Abstract: Alkenyl succinic anhydrides having a decreased amount of tar and color bodies are made by the reaction of an olefin with maleic anhydride in the presence of an arylfluorophosphite (e.g. 2,2'-ethylidenebis(4,6-di-tert-butylphenyl) fluorophosphite) and optionally a hindered phenolic antioxidant such as 2,4,6-tri(3,5-di-tert-butyl-4-hydroxybenzyl) mesitylene.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: September 18, 1990
    Assignee: Ethyl Corporation
    Inventors: Paul S. Hale, Kju H. Shin