Patents by Inventor Hidemi Nukada

Hidemi Nukada 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: 5856471
    Abstract: An electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer, the photosensitive layer containing a hydroxymetal or hydroxysilicon phthalocyanine pigment represented by formula (I) as a charge generating material, the phthalocyanine pigment having been treated with an orcanometallic compound having a hydrolyzable functional group or a hydrolysis product thereof: ##STR1## wherein Me represents A, Ga, In, Si, Ge or Sn; X representsH, C, Br or I; m represents an integer of from I to 4; and n represents 1 where Me is A, Ga or In, or 2 where Me is Si, Ge or Sn.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: January 5, 1999
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hidemi Nukada, Takahiro Suzuki, Katsumi Nukada, Katsumi Daimon, Yasuo Sakaguchi
  • Patent number: 5815776
    Abstract: A negative-electrification type electrophotographic photoreceptor which has an undercoat layer slightly soluble or insoluble in solvents and retains stable properties, and to provide a contact electrification type electrophotographic apparatus employing the photoreceptor and less apt to suffer dielectric breakdown. The electrophotographic photoreceptor comprises an electrically conductive support having thereon an undercoat layer and a photosensitive layer, in which the undercoat layer comprises an electron-transporting pigment and a reactive organometallic compound. This electrophotographic photoreceptor is suitable for use in an electrophotographic apparatus in which the photoreceptor is charged by applying a voltage to a charging member disposed so as to be in contact with the photoreceptor, in particular, an erase-less electrophotographic apparatus.
    Type: Grant
    Filed: May 12, 1997
    Date of Patent: September 29, 1998
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Hidemi Nukada
  • Patent number: 5795690
    Abstract: An electrophotographic photoreceptor is disclosed which comprises an electrically-conductive substrate having provided thereon an undercoat layer and a photosensitive layer, wherein said undercoat layer comprises a crosslinkable matrix and an electron-transporting material.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: August 18, 1998
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Ichiro Takegawa, Hidemi Nukada, Hiroshi Yamamoto, Koji Goshima, Takaaki Kimura
  • Patent number: 5677097
    Abstract: In an electrophotographic photoreceptor in which an undercoating layer and a photosensitive layer are provided on a conductive substrate, the undercoating layer preferably contains at least one electron transporting pigment and a reactive organometallic compound, the electron transporting pigment being selected from a group consisting of an electron transporting polycyclic quinone pigment such as brominated anthoanthrone, an electron transporting perylene pigment, an electron transporting phthalocyanine pigment, and an electron transporting azo pigment, and the surface of the electrophotographic photoreceptor contains at least one resin selected from electric charge transporting polycarbonate and electric charge transporting polyester.
    Type: Grant
    Filed: January 15, 1997
    Date of Patent: October 14, 1997
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hidemi Nukada, Katsumi Nukada
  • Patent number: 5658702
    Abstract: A negative-electrification type electrophotographic photoreceptor which has an undercoat layer slightly soluble or insoluble in solvents and retains stable properties, and to provide a contact electrification type electrophotographic apparatus employing the photoreceptor and less apt to suffer dielectric breakdown. The electrophotographic photoreceptor comprises an electrically conductive support having thereon an undercoat layer and a photosensitive layer, in which the undercoat layer comprises an electron-transporting pigment and a reactive organometallic compound. This electrophotographic photoreceptor is suitable for use in an electrophotographic apparatus in which the photoreceptor is charged by applying a voltage to a charging member disposed so as to be in contact with the photoreceptor, in particular, an erase-less electrophotographic apparatus.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: August 19, 1997
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Hidemi Nukada
  • Patent number: 5622801
    Abstract: An electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer, the photosensitive layer containing a hydroxymetal or hydroxysilicon phthalocyanine pigment represented by formula (I) as a charge generating material, the phthalocyanine pigment having been treated with an organometallic compound having a hydrolyzable functional group or a hydrolysis product thereof: ##STR1## wherein Me represents Al, Ga, In, Si, Ge or Sn; X represents H, Cl, Br or I; m represents an integer of from 1 to 4; and n represents 1 where Me is Al, Ga or In, or 2 where Me is Si, Ge or Sn.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: April 22, 1997
    Assignee: Fuji Xerox Co., Ltd
    Inventors: Hidemi Nukada, Takahiro Suzuki, Katsumi Nukada, Katsumi Daimon, Yasuo Sakaguchi
  • Patent number: 5512674
    Abstract: A process for preparing a titanyl phthalocyanine crystal showing at least one diffraction peak at a Bragg angle (2.theta..+-.0.2) of 27.3.degree. is disclosed, which comprises dissolving or suspending titanyl phthalocyanine in concentrated sulfuric acid to form a solution or a slurry and diluting the solution or slurry with an alcohol solvent, an aromatic solvent, a mixed solvent of an alcohol solvent and water, a mixed solvent of an aromatic solvent and water, or a mixed solvent of an alcohol solvent and an aromatic solvent with or without water thereby to precipitate a crystal, and, if desired, treating the precipitated crystal with an alcohol solvent, an aromatic solvent, a mixed solvent of an alcohol solvent and an aromatic solvent or a mixed solvent of an alcohol solvent and/or an aromatic solvent and water. The resulting titanyl phthalocyanine crystal exhibits high photosensitivity and excellent durability as a photoconductive material of an electrophotographic photoreceptor.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: April 30, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hidemi Nukada, Akihiko Tokida, Yasuo Sakaguchi, Katsumi Daimon, Katsumi Nukada
  • Patent number: 5440029
    Abstract: A novel titanyl phthalocyanine crystal, a photoconductive material comprising the same, and an electrophotographic photoreceptor using the same are disclosed. The titanyl phthalocyanine crystal has a primary particle diameter ranging from 0.03 to 0.15 .mu.m, shows a maximum X-ray diffraction peak at a Bragg angle (2.theta..+-.0.2.degree.) of 27.3.degree., has a ellipsoidal tabular form, and has a BET specific surface area of not less than 35 m.sup.2 /g. The crystal has improved crystal form stability against solvents and holds its crystal form for an extended period of time in a dispersed and coated state. An electrophotographic photoreceptor using the crystal as a photoconductive material is excellent in sensitivity, stability, and durability.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: August 8, 1995
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hidemi Nukada, Yasuo Sakaguchi, Taketoshi Hoshizaki, Fumio Ojima, Masayuki Nishikawa, Kohichi Yamamoto, Yumiko Komori
  • Patent number: 5378569
    Abstract: Oxytitanium phthalocyanine hydrate crystal and an electrophotographic photoreceptor using said crystal are disclosed. The structural formula of the crystal is TiOPc(H.sub.2 O).sub.n wherein Pc represents a phthalocyanine residual group, and n represents from 0.15 to 1; and the elemental analysis values of C, H and N are as follows: C: 65.0 to 66.3 %; H: 2.5 to 3.1 %; and N: 18.5 to 19.3 %.
    Type: Grant
    Filed: November 5, 1993
    Date of Patent: January 3, 1995
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsumi Nukada, Katsumi Daimon, Masakazu Iijima, Yasuo Sakaguchi, Hidemi Nukada, Akihiko Tokida
  • Patent number: 5298617
    Abstract: Oxytitanium phthalocyanine hydrate crystal and an electrophotographic photoreceptor using said crystal are disclosed. The structural formula of the crystal is TiOPc(H.sub.2 O).sub.n wherein Pc represents a phthalocyanine residual group, and n represents from 0.15 to 1; and the elemental analysis values of C, H and N are as follows: C: 65.0 to 66.3%; H: 2.5 to 3.1%; and N: 18.5 to 19.3%.
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: March 29, 1994
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsumi Nukada, Katsumi Daimon, Masakazu Iijima, Yasuo Sakaguchi, Hidemi Nukada, Akihiko Tokida
  • Patent number: 5252417
    Abstract: A novel titanyl phthalocyanine crystal showing X-ray diffraction peaks at Bragg angles (2.theta..+-.0.2) of 27.2.degree., 24.0.degree., 18.0.degree., 14.3.degree., and 9.5.degree. and an electrophotographic photoreceptor containing the same as a charge generating layer are disclosed. The photoreceptor exhibits high photosensitivity and durability.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: October 12, 1993
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Akihiko Tokida, Yasuo Sakaguchi, Hidemi Nukada, Kohichi Yamamoto, Katsumi Daimon