Patents Examined by D. D. Cair
  • Polyetherimides and their production
    Patent number: 4990627
    Abstract: The polyetherimides have repeating groups which may be represented by the general formula: ##STR1## They are produced from novel monomers of the formula ##STR2## Synthesis procedures for forming such monomers are also described.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: February 5, 1991
    Assignee: Ethyl Corporation
    Inventors: Gene C. Robinson, G. Patrick Stahly