Patents by Inventor Masakatsu Nakatsuka

Masakatsu Nakatsuka 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).

  • Polarizing film
    Patent number: 5059356
    Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
    Type: Grant
    Filed: September 6, 1990
    Date of Patent: October 22, 1991
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Katsuji Nakamura, Junichi Fujio, Shin Hosonuma, Masakatsu Nakatsuka, Tsutomu Nishizawa
  • P-amino substituted tetraphenylthiophenes and electrophotographic photoreceptors containing them
    Patent number: 5023343
    Abstract: There are here provided a novel tetraphenylthiophene derivative represented by the general formula ##STR1## wherein AM is a tertiary amino group, each of l, m and n is the integer 0 or 1 and l.gtoreq.m.gtoreq.n are useful as the charge-transporting material in an electrophotographic photoreceptor having an electrically conductive base and a photosensitive layer thereon containing a charge-transporting material and a charge-generating material, which preferably is an azo compound.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: June 11, 1991
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Eishi Tanaka, Tsutomu Nishizawa, Yasuyuki Yamada, Hisato Itoh, Akihiro Yamaguchi, Masakatsu Nakatsuka
  • Phthalocyanine compounds and utility thereof
    Patent number: 4970021
    Abstract: Phthalocyanine compounds are described, which are represented by the following general formula (I): ##STR1## wherein R.sub.1 -R.sub.8 are individually a hydrogen atom or an alkyl or aryl group, a-h stand individually for an integer of 1-20, and M denotes two hydrogen atoms or a metal atom, metal halide, metal oxide, metal hydroxide, dialkylmetal, diarylmetal, bis(alkyloxy)metal or bis(trialkylsilyloxy)metal. Optical recording media and liquid crystal display panels, which contain at least one of the phthalocyanine compounds, are also described.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: November 13, 1990
    Assignees: Mitsui Toatsu Chemicals, Incorporated, Yamamoto Chemicals, Incorporated
    Inventors: Masakatsu Nakatsuka, Tsutomu Nishizawa, Takahisa Oguchi, Hisato Itoh, Katashi Enomoto
  • P-amino substituted tetraphenylthiophenes and electrophotographic photoreceptors containing them
    Patent number: 4963449
    Abstract: There are here provided a novel tetraphenylthiophene derivative represented by the general formula ##STR1## wherein AM is a tertiary amino group, each of l, m and n is the integer 0 or 1 and l.gtoreq.m.gtoreq.n are useful as the charge-transporting material in an electrophotographic photoreceptor having an electrically conductive base and a photosensitive layer thereon containing a charge-transporting material and a charge-generating material, which preferably is an azo compound.
    Type: Grant
    Filed: November 17, 1988
    Date of Patent: October 16, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Eishi Tanaka, Tsutomu Nishizawa, Yasuyuki Yamada, Hisato Itoh, Akihiro yamaguchi, Masakatsu Nakatsuka
  • 1,2-naphthalocyanine near-infrared absorbent and recording/display materials using same
    Patent number: 4960538
    Abstract: Disclosed are near-infrared absorbents comprising 1,2-naphthalocyanine derivatives wherein the four naphthalene rings contained in the molecule independently have 1 to 6 substituents. Also disclosed is the use of these near-infrared absorbents in optical recording media, near-infrared absorption filters and display materials.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: October 2, 1990
    Assignees: Mitsui Toatsu Chemicals, Inc, Yamamoto Chemicals, Inc.
    Inventors: Hisato Itoh, Takahisa Oguchi, Katashi Enomoto, Masakatsu Nakatsuka, Tsutomu Nishizawa
  • Polarizing film
    Patent number: 4824882
    Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
    Type: Grant
    Filed: May 20, 1986
    Date of Patent: April 25, 1989
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Katsuji Nakamura, Junichi Fujio, Shin Hosonuma, Masakatsu Nakatsuka, Tsutomu Nishizawa