Patents by Inventor Gus George Orphanides

Gus George Orphanides 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).

  • Synthesis of dimaleimides
    Patent number: T971003
    Abstract: bifunctional maleimides can be prepared in high yield by reacting an organic diamine with maleic anhydride in a solvent composed of the azeotrope of hexamethylphosphoramide or 1-methyl-2-pyrrolidone and acetic acid, followed by dehydration of the intermediate with acetic anhydride in the presence of an alkali metal salt of a C.sub.2 -C.sub.5 aliphatic acid. The solvent systems are recoverable by reduced pressure distillation and can be used in subsequent syntheses of maleimides.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: June 6, 1978
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Gus George Orphanides