Patents by Inventor Hisao Kouno

Hisao Kouno 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).

  • Patent number: 5569749
    Abstract: An organic photoconductive material is represented by the following general formula [1]:A.sub.1 --N.dbd.N--B--N.dbd.N--A.sub.2 [1],wherein B is a divalent organic group bonded to nitrogen atoms forming azo groups, A.sub.1 and A.sub.2 are groups different from each other, A.sub.1 is represented by the following general formula [A1]: ##STR1## wherein X is an atomic group which is necessary for forming an aromatic hydrocarbon ring or an aromatic hetero-ring by condensation with the benzene ring, Y is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, m is an integer of 1 to 4, R is an aromatic hydrocarbon ring group or an aromatic hetero-ring group and n is 1 or 2, and A.sub.2 is a group represented by one of the following general formulae [A2] and [A3]: ##STR2## wherein a.sub.1 is a group selected from R, --N.dbd.CH--R and ##STR3## R, X, Y, m and n are the same as those in the general formula [A1] and p is 0 or 1.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: October 29, 1996
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Hisao Kouno, Shyouichi Takahashi, Kazuhiro Higashide, Nakaji Komiyama, Osamu Suda, Masaru Hasegawa
  • Patent number: 5506346
    Abstract: An organic photoconductive material is represented by the following general formula [1]:A.sub.1 -N.dbd.N-B-N.dbd.N-A.sub.2 [1],wherein B is a divalent organic group bonded to nitrogen atoms forming azo groups, A.sub.1 and A.sub.2 are groups different from each other, A.sub.1 is represented by the following general formula [A1]: ##STR1## wherein X is an atomic group which is necessary for forming an aromatic hydrocarbon ring or an aromatic hetero-ring by condensation with the benzene ring, Y is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, m is an integer of 1 to 4, R is an aromatic hydrocarbon ring group or an aromatic hetero-ring group and n is 1 or 2, and A.sub.2 is a group represented by one of the following general formulae [A2] and [A3]: ##STR2## wherein a.sub.1 is a group selected from R, -N.dbd.CH-R and ##STR3## R, X, Y, m and n are the same as those in the general formula [A1] and p is 0 or 1.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: April 9, 1996
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Hisao Kouno, Shyouichi Takahashi, Kazuhiro Higashide, Nakaji Komiyama, Osamu Suda, Masaru Hasegawa
  • Patent number: 5344736
    Abstract: An electrophotographic photoreceptor is provided with a photosensitive layer, which contains an azo compound represented by the following g general formula (1): ##STR1## wherein A means a coupler residuum having phenolic OH radicals, R.sub.1 and R.sub.2 designate, respectively, a radical of an integer of, both, m=0.about.4, n =0.about.4, selected from the group consisting of hydrogen, halogen atoms, alkyl group, alkoxy group, and di-substituted amino group.The electrophotographic photoreceptor of this invention has excellent electrification characteristics, sensitivity characteristics and image-forming property as well as good sensitivity. In addition, its sensitivity and electrification characteristics undergo less variations even when employed repeatedly. It also undergoes little light-induced fatigue. It has high weatherability.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: September 6, 1994
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Nakaji Komiyama, Hisao Kouno, Kazuhiro Higashide, Osamu Suda, Masaru Hasegawa
  • Patent number: 4912001
    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 couple residuum represented by the following general formula (I): ##STR1## wherein X means an atomic group necessary for condensing with a benzene ring to form a substituted or unsubstituted aromatic hydrocarbon ring, or substituted or unsubstituted aromatic heterocyclic ring, Y denotes a radical selected from the group consisting of hydrogen, halogen atoms, cyano radicals, and substituted or unsubstituted alkyl, or alkoxy group, and n stands for an integer of 0.about.4, R.sub.1 and R.sub.2 designate, respectively, hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alalkyl, substituted or unsubstituted aromatic hydrocarbon ring or substituted or unsubstituted aromatic heterocyclic ring, and said R.sub.1 and R.sub.2 may be mutually same or different, or may form a ring together with nitrogen atom.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: March 27, 1990
    Assignee: Dainichi Seika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Hisao Kouno, Hiroaki Saikatsu, Osamu Suda, Tetsuhiro Umezaki, Norio Tanaka, Toshifumi Sekino, Masaru Hasegawa, Yoshio Abe, Shojiro Horiguchi