Patents Examined by J. Doll
  • Phenylethynyl substituted aromatic diamines
    Patent number: 4038320
    Abstract: As new compositions of matter, 2,2'-bis(phenylethynyl)-4,4'-diaminobiphenyl and 2,2'-bis(phenylethynyl)-5,5'-diaminobiphenyl. The compounds are useful as monomers suitable for the preparation of thermally stable polymer systems such as polyimides, polyamides and poly-Schiff bases.
    Type: Grant
    Filed: April 19, 1976
    Date of Patent: July 26, 1977
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Fred E. Arnold, Frederick L. Hedberg