Patents by Inventor Takuji Katoh

Takuji Katoh 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).

  • Arylamine compound
    Patent number: 9293713
    Abstract: An arylamine compound including: a partial structure shown in formula (1-1) or (1-2), wherein either X or Y is one of leaving substituents and the other is a hydrogen atom; either (X1, X2) or (Y1, Y2) is one of the leaving substituents respectively and the other is the hydrogen atom respectively; each of Q1, Q2, Q3, Q4, Q5, and Q6 is selected from the hydrogen atom, a halogen atom, organic substituents other than the leaving substituents, and an atomic bonding to link with an adjacent arylamine group respectively; and adjacent two substituents selected from Q1, Q2, Q3, Q4, Q5, and Q6 may be linked together to form the ring which may be a part of an arylamine group.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: March 22, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Daisuke Goto, Takuji Katoh, Satoshi Yamamoto, Masataka Mohri, Satoshi Miyagawa, Hajime Nakanotani
  • ARYLAMINE COMPOUND
    Publication number: 20130225858
    Abstract: An arylamine compound including: a partial structure shown in formula (1-1) or (1-2), wherein either X or Y is one of leaving substituents and the other is a hydrogen atom; either (X1, X2) or (Y1, Y2) is one of the leaving substituents respectively and the other is the hydrogen atom respectively; each of Q1, Q2, Q3, Q4, Q5, and Q6 is selected from the hydrogen atom, a halogen atom, organic substituents other than the leaving substituents, and an atomic bonding to link with an adjacent arylamine group respectively; and adjacent two substituents selected from Q1, Q2, Q3, Q4, Q5, and Q6 may be linked together to form the ring which may be a part of an arylamine group.
    Type: Application
    Filed: February 28, 2013
    Publication date: August 29, 2013
    Inventors: Daisuke GOTO, Takuji Katoh, Satoshi Yamamoto, Masataka Mohri, Satoshi Miyagawa, Hajime Nakanotani
  • Photoreceptor, method of evaluating a photoreceptor, and method of producing the photoreceptor
    Patent number: 6649313
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t) (&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t (&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated a
    Type: Grant
    Filed: October 30, 2002
    Date of Patent: November 18, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto
  • Photoreceptor, method of evaluating a photoreceptor, and method of producing the photoreceptor
    Publication number: 20030175606
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t)(&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t(&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated are
    Type: Application
    Filed: October 30, 2002
    Publication date: September 18, 2003
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto
  • Photoreceptor, method of evaluating the photoreceptor, method of producing the photoreceptor, and image formation apparatus using the photoreceptor
    Patent number: 6534227
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t)(&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t(&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated are
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: March 18, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto
  • Photoreceptor, method of evaluting the photoreceptor, method of producing the photoreceptor, and image formation apparatus using the photoreceptor
    Publication number: 20020018947
    Abstract: A photoreceptor including a support and a photosensitive layer formed thereon, optionally an undercoat layer between the support and the photosensitive layer, wherein when a group of data consisting of N samples of the height x(t)(&mgr;m) of a profile at the interface of the support on the side of the photosensitive layer, the interface of the photosensitive layer on the side of the support, and/or the interface of the undercoat layer on the side of the photosensitive layer, measured perpendicular to a horizontal direction of the support, taken at &Dgr;t (&mgr;m) intervals in the horizontal direction, is subjected to Fourier transformation in accordance with a formula as specified in the specification, in a power spectrum obtained by the Fourier transformation, I(S) represented by a formula specified in the specification has a particular value, a method of evaluating the above photoreceptor, a method of producing the photoreceptor, and an image formation apparatus in which the photoreceptor is incorporated ar
    Type: Application
    Filed: January 12, 2001
    Publication date: February 14, 2002
    Applicant: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kabata, Toshio Fukagai, Junichi Yamazaki, Katsuhiko Tani, Noriyuki Iwata, Takuji Katoh, Yoshio Watanabe, Yuka Miyamoto