Patents by Inventor Tamio Mikoda

Tamio Mikoda 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).

  • Sublimation thermal transfer printing sheet comprising novel magenta dyestuffs
    Patent number: 5300475
    Abstract: Disclosed are magenta anthraquinone dyestuffs for sublimation thermaltransfer printing of one of the formulas ##STR1## wherein R is a halogen atom, methyl or methoxy; wherein R.sub.1 is a hydrogen atom, hydroxyl, a halogen atom, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms; and wherein R.sub.2 is a hydrogen atom, a halogen atom, alkyl or 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, with the proviso that in formula (3) either R.sub.1 or R.sub.2 is not a hydrogen atom.
    Type: Grant
    Filed: August 31, 1992
    Date of Patent: April 5, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Keisuke Takuma, Tsukasa Ohyama, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida, Akitoshi Igata
  • Isopropyl 1-amino-4-m-toluidinoanthraquinone-2-carboxylate
    Patent number: 5182395
    Abstract: Disclosed are a novel compound represented by the formula ##STR1## and compositions for sublimation transfer records and for color toners containing the same.
    Type: Grant
    Filed: October 12, 1990
    Date of Patent: January 26, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keisuke Takuma, Tsukasa Ohyama, Akitoshi Igata, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida
  • Sublimation thermaltransfer printing sheet comprising novel magenta dyestuffs
    Patent number: 5168093
    Abstract: Disclosed are magenta anthraquinone dyestuffs for sublimation thermaltransfer printing of one of the formulas ##STR1## wherein R is a halogen atom, methyl or methoxy; wherein R.sub.1 is a hydrogen atom, hydroxyl, a halogen atom, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms; and wherein R.sub.2 is a hydrogen atom, a halogen atom, alkyl or 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, with the proviso that in formula (3) either R.sub.1 or R.sub.2 is not a hydrogen atom.
    Type: Grant
    Filed: July 10, 1990
    Date of Patent: December 1, 1992
    Assignee: Mitsui Toatsu Chemicals Inc.
    Inventors: Keisuke Takuma, Tsukasa Ohyama, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida, Akitoshi Igata
  • Isopropyl 1-amino-4-m-toluidinoanthraquinone-2-carboxylate, cyan composition for sublimation transfer record and cyan composition for color toner containing it
    Patent number: 5002925
    Abstract: Disclosed are a novel compound represented by the formula ##STR1## a composition for sublimation transfer record containing the above-mentioned compound, and a composition for color toner containing the above-mentioned compound.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: March 26, 1991
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Keisuke Takuma, Tsukasa Ohyama, Akitoshi Igata, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida
  • Color toner composition
    Patent number: 4954410
    Abstract: A novel negative charge color toner composition for electrostatic charge development having good light resistance and copy sharpness which contains, as a dyestuff in a toner resin, a 1-amino-2-phenoxy- or 2-thiophenoxy-4-hydroxyanthraquinone whose phenoxy or thophenoxy group is substituted and/or a 1,4-diamino-2,3-phenoxyanthraquinone whose phenoxy group is substitited, which can be conventionally produced.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: September 4, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Keisuke Takuma, Tsukasa Ohyama, Isamu Ghoda, Tamio Mikoda, Hitoshi Koshida, Akitoshi Igata
  • Pyridone dyestuff for thermal transfer recording and printing sheets and methods employing same
    Patent number: 4898850
    Abstract: Thermally printable sheets, such as paper coated with a polymer such as a polyester or a polyacrylonitrile are colored yellow by a thermal transfer printing process, e.g., using a decal printing transfer sheet, which employs as a yellow dyestuff a 2-pyridone of the formula ##STR1## wherein R.sup.1 is a lower alkyl, and R.sup.2 is lower alkyl, lower alkoxy-lower alkyl, carbocyclic aryl-lower alkyl, cyclo-lower alkyl, lower alkenyl or lower alkoxycarbonylmethyl.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: February 6, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Akitosi Igata, Tamio Mikoda
  • Process for producing dianthraquinone-N,N'-dihydrazine and its chlorination product
    Patent number: 4628091
    Abstract: A process for producing dianthraquinone-N,N'-dihydrazine or its chlorination product, which comprises condensing 1-aminoanthraquinone at an elevated temperature in the presence of 1,3-dimethyl-2-imidazolidinone using an oxidizing agent and an alkaline condensing agent, and subjecting the resulting condensation product to a treatment known per se.
    Type: Grant
    Filed: June 13, 1984
    Date of Patent: December 9, 1986
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kimitoshi Kato, Hiroshi Aiga, Tamio Mikoda, Tunehiro Sakai
  • Dichroic dye and liquid crystalline composition for color display
    Patent number: 4552684
    Abstract: An anthraquinonic dye of the formula ##STR1## is provided. When used as dichloric dyes in liquid crystalline color display elements, these dyes (1) have sufficient coloring ability in small amounts, (2) have a high dichloric ratio, (3) are fully soluble in liquid crystals, and (4) have excellent durability, are stable and do not degrade the performance of a display device upon long-term use.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: November 12, 1985
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yasuyuki Yamada, Tsutomu Nishizawa, Tamio Mikoda, Tooru Miyahara, Masaharu Kikutsugi