Patents by Inventor Takahisa Oguchi

Takahisa Oguchi 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).

  • Method for preparation alkoxyphthalocyanine
    Patent number: 5220010
    Abstract: There is here disclosed a method for preparing an alkoxyphthalocyanine represented by the formula (1): ##STR1##
    Type: Grant
    Filed: December 24, 1991
    Date of Patent: June 15, 1993
    Assignees: Mitsui Toatsu Chemicals, Incorporated, Yamamoto Chemicals, Incorporated
    Inventors: Takahisa Oguchi, Kenichi Sugimoto, Shin Athara, Hisato Itoh, Mansuke Matsumoto, Toshihiro Masaoka, Masakazu Nakamura
  • Near infrared absorbers and display/recording materials using the same
    Patent number: 5124067
    Abstract: Near infrared absorbers which have a molecular extinction coefficient of 200,000 or more and are represented by the formula (I) ##STR1## wherein each of Y.sup.1, Y.sup.2, Y.sup.3, Y.sup.4, Y.sup.5, Y.sup.6, Y.sup.7 and Y.sup.8 is hydrogen, an alkyl group, alkoxyl group or alkylthio group; each of A.sup.1, A.sup.2, A.sup.3, A.sup.4, A.sup.5, A.sup.6, A.sup.7 and A.sup.8 is hydrogen, halogen, a nitro group, alkyl group, aralkyl group, alkenyl group, alkynyl group, alkoxyl group, aryloxy group, alkylthio group or arylthio group; and Met represents two hydrogen atoms or a metal, are useful for the production of optical display and recording materials.
    Type: Grant
    Filed: December 15, 1989
    Date of Patent: June 23, 1992
    Assignees: Mitsui Toatsu Chemicals, Incorporated, Yamamoto Chemicals, Incorporated
    Inventors: Hisao Itoh, Katashi Enomoto, Takahisa Oguchi, Tutomu Nishizawa
  • Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same
    Patent number: 5024926
    Abstract: Near-infrared absorbers which contain phthalocyanine derivatives in which the four benzene rings contained in the molecule independently have 1 to 4 substituents are light and thermal resistant and possess high molar extinction coefficients. Such near-infrared absorbers are useful in optical recording media, near-infrared absorption filters, and liquid crystal display devices.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: June 18, 1991
    Assignees: Mitsui Toatsu Chemicals, Incorporated, Yamamoto Chemicals, Incorporated
    Inventors: Hisato Itoh, Katashi Enomoto, Takahisa Oguchi, Tsutomu Nishizawa
  • 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
  • 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