Patents by Inventor Theodorus N. Visser

Theodorus N. Visser 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).

  • Esters containing phenolic groups as epoxy resin curing agents
    Patent number: 4214068
    Abstract: Phenolic curing agents, especially suitable for use in powder coatings, are prepared by reacting a dihydric phenol (diphenylol propane), a diepoxide (liquid diglycidyl ether of diphenylol propane), and a dicarboxylic acid (adipic acid) with the phenolic functionality in excess over the difference between the epoxy functionality and the acid functionality.
    Type: Grant
    Filed: May 10, 1979
    Date of Patent: July 22, 1980
    Assignee: Shell Oil Company
    Inventors: Gerardus C. M. Schreurs, Werner Th. Raudenbusch, Theodorus N. Visser