Patents by Inventor Kouji Koura

Kouji Koura 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).

  • Method for producing an imide oligomer
    Patent number: 5066771
    Abstract: A method for producing an imide oligomer soluble in an organic solvent by reacting three components of an aromatic tetracarboxylic acid or its derivative, an aromatic diamine and an end-capping agent, wherein the aromatic diamine is a condensation product of o-ethylamiline with formaldehyde, and the end-capping agent is an ethynyl phthalic acid of the formula: ##STR1## wherein R is a hydrogen atom or a monovalent group selected from the group consisting of an aliphatic group, an alicyclic group and an aromatic group, or its derivative.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: November 19, 1991
    Assignee: Kozo Iizuka, Director-General of Agency of Industrial Science and Technology
    Inventors: Seiichi Hino, Shoichi Satou, Kouji Koura, Osamu Suzuki