Patents by Inventor Daisuke Kuboshima

Daisuke Kuboshima 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).

  • Electrophotosensitive material
    Publication number: 20040058257
    Abstract: The present invention provides an electrophotosensitive material which realizes uniform dispersion of phthalocyanines in a photosensitive layer and has high sensitivity to a digital light source, and also excellent in charge stability under the high temperature atmosphere, weatherability and NOx resistance.
    Type: Application
    Filed: September 23, 2003
    Publication date: March 25, 2004
    Inventors: Jun Azuma, Kazunari Hamasaki, Daisuke Kuboshima, Hisakazu Honma
  • Titanyl phthalocyanine crystal and production method of the same, and electrophotosensitive material
    Publication number: 20040049027
    Abstract: The present invention relates to a novel titanyl phthalocyanine crystal which can prepare a coating solution having excellent storage stability because it satisfies both of the following two characteristics (a) and (b), a method of producing the same, an electrophotosensitive material using the above crystal as an electric charge generating material.
    Type: Application
    Filed: August 27, 2003
    Publication date: March 11, 2004
    Inventors: Kazunari Hamasaki, Daisuke Kuboshima, Hisakazu Honma, Jun Azuma, Eiichi Miyamoto
  • Stilbeneamine derivative and electrophotosensitive material using the same
    Patent number: 6653034
    Abstract: The present invention relates to a stilbeneamine derivative represented by a formula (1): wherein Ar1 and Ar2 each denote an aryl group; Ar3 denotes an arylene group; Ar4 denotes an arylene group or divalent heterocyclic group; provided that when a thiophene ring in the formula is 2-thiophenyl, ‘n’ is 1 and when the thiophene ring is 3-thiophenyl, ‘n’ is 0 or 1, and also relates to an electrophotosensitive material comprising a photosensitive layer containing this derivative. The derivative is excellent in electric charge transferring capability, compatibility with a binder resin and stability, thus offering the electrophotosensitive material superior to the prior-art products in sensitivity and repeatability.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: November 25, 2003
    Assignee: Kyocera Mita Corporation
    Inventors: Yoshio Inagaki, Daisuke Kuboshima
  • Titanyl phthalocyanine crystal and production method of the same, and electrophotosensitive material and production method of the same
    Patent number: 6528645
    Abstract: The present invention relates to a titanyl phthalocyanine crystal having excellent storage stability of coating solution, to satisfy that (a) the crystal does not have a peak of a change in temperature except for a peak associated with evaporation of adsorbed water in differential scanning calorimetry or that (b) the crystal recovered after dipping in an organic solvent for 24 hours at least a maximum peak at a Bragg angle 2&thgr;±0.2°=27.2° and has no peak at 26.2° in a CuK &agr; characteristic X-ray diffraction spectrum, and a method of producing the same; and an electrophotosensitive material using the above crystal, and a method of producing the same.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: March 4, 2003
    Assignee: Kyocera Mita Corporation
    Inventors: Kazunari Hamasaki, Yukimasa Watanabe, Hirofumi Kawaguchi, Mitsuo Ihara, Susumu Hiroshima, Daisuke Kuboshima
  • Stilbeneamine derivative and electrophotosensitive material using the same
    Publication number: 20020172877
    Abstract: The present invention relates to a stilbeneamine derivative represented by a formula (1): 1
    Type: Application
    Filed: January 9, 2002
    Publication date: November 21, 2002
    Inventors: Yoshio Inagaki, Daisuke Kuboshima
  • Electrophotosensitive material and method of producing the same
    Patent number: 6444385
    Abstract: The present invention relates to an electrophotosensitive material wherein a layer containing a binder resin and a pigment among a photosensitive layer is formed by applying and drying a coating solution prepared by dispersing the binder resin and the pigment in a dispersion medium containing alcohol represented by the formula (1): wherein R1, R2 and R3 are the same or different and represent a hydrogen atom or an alkyl group; the electrophotosensitive material is free from lowering of the sensitivity due to formation of agglomerates of the pigment and is superior in sensitivity characteristics.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: September 3, 2002
    Assignee: Kyocera Mita Corporation
    Inventors: Jun Azuma, Mitsuo Ihara, Maki Uchida, Daisuke Kuboshima, Yukikatsu Imanaka, Hiromi Nakatsu, Teruyo Taguchi
  • Electrophotosensitive material and method of producing the same
    Publication number: 20010038960
    Abstract: The present invention relates to an electrophotosensitive material wherein a layer containing a binder resin and a pigment among a photosensitive layer is formed by applying and drying a coating solution prepared by dispersing the binder resin and the pigment in a dispersion medium containing alcohol represented by the formula (1): 1
    Type: Application
    Filed: March 15, 2001
    Publication date: November 8, 2001
    Inventors: Jun Azuma, Mitsuo Ihara, Maki Uchida, Daisuke Kuboshima, Yukikatsu Imanaka, Hiromi Nakatsu, Teruyo Taguchi