Patents by Inventor Hisao Kohno

Hisao Kohno 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).

  • Electrophotographic photoreceptor having an azo compound
    Patent number: 4931349
    Abstract: An electrophotographic photoreceptor is provided with a photosensitive layer, which contains an azo compound having in the molecule thereof at least one azo group coupled with a coupler residuum represented by the following general formula (I): ##STR1## wherein X means a residuum capable of condensing with a benzene ring to form a substituted or unsubstituted aromatic hydrocarbon ring or a substituted or unsubstituted aromatic heterocyclic ring, Y denotes a hydrogen or halogen atom or alkyl or alkoxy group, and n stands for an integer of 0-3.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: June 5, 1990
    Assignee: Dainichiseika Color & Chemicals Mfg. Co.
    Inventors: Masaru Hasegawa, Osamu Suda, Hisao Kohno, Toshifumi Sekino, Tetsuhiro Umezaki, Norio Tanaka