Patents by Inventor Youichi Ohhira

Youichi Ohhira 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).

  • Solvent for chromogenic dye-precursor material for pressure-sensitive recording paper sheet and pressure-sensitive recording paper sheet prepared by using the solvent
    Patent number: 4822767
    Abstract: A solvent for chromogenic dye-precursor material for pressure-sensitive recording paper sheet, comprising 50 to 80% by weight of p-monoisopropylbiphenyl and 50 to 20% by weight of hydrogenated terphenyl, and a pressure-sensitive recording paper sheet prepared by using the solvent.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: April 18, 1989
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshio Okada, Tadashi Nakamura, Youichi Ohhira
  • Solvent for chromogenic dye-precursor material for pressure-sensitive recording paper sheet and pressure-sensitive recording paper sheet prepared by using the solvent
    Patent number: 4795493
    Abstract: Disclosed herein are a substantially odorless solvent for a chromogenic dye-precursor material for a pressure-sensitive recording paper sheet, which comprises from 0 to 20% by weight of m-isopropylbiphenyl, from 40 to 75% by weight of p-isopropylbiphenyl and from 5 to 40% by weight of diisopropyldiphenyl, and a pressure-sensitive recording paper sheet comprising a colour-development sheet coated with microcapsules containing a dye solution which is composed of the chromogenic dye-precursor material and the substantially odorless solvent, and a colour-developer sheet.
    Type: Grant
    Filed: March 26, 1987
    Date of Patent: January 3, 1989
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshio Okada, Tadashi Nakamura, Youichi Ohhira
  • Solvent for the chromogenic dye-precursor material for a pressure-sensitive recording paper sheet and a pressure-sensitive recording paper sheet prepared by using the solvent
    Patent number: 4774136
    Abstract: Disclosed herein are a solvent for a chromogenic dye-precursor material for a pressure-sensitive recording paper sheet, comprising (1) 30 to 80% by weight of p-monoisopropylbiphenyl or a biphenyl mixture of not less than 80% by weight of p-monoisopropylbiphenyl, not more than 20% by weight of m-monoisopropylbiphenyl and not more than 10% by weight of diisopropylbiphenyl, and (2) 70 to 20% by weight of diisopropylnaphthalene or a naphthalene mixture of not less than 97% by weight of diisopropylnaphthalene, not more than 1% by weight of monoisopropylnaphthalene and not more than 2% by weight of triisopropylnaphthalene, and a pressure-sensitive recording paper sheet prepared by using the solvent.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: September 27, 1988
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshio Okada, Tadashi Nakamura, Youichi Ohhira
  • Solvent for chromogenic dye-precursor material for pressure-sensitive recording paper sheet and pressure-sensitive recording paper sheet prepared by using the solvent
    Patent number: 4699659
    Abstract: Disclosed herein are a solvent for a chromogenic dye-precursor material for a pressure-sensitive recording paper sheet, comprising (1) 30 to 80% by weight of p-monoisopropylbiphenyl or a biphenyl mixture of not less than 80% by weight of p-monoisopropylbiphenyl, not more than 20% by weight of m-monoisopropylbiphenyl and not more than 10% by weight of diisopropylbiphenyl, and (2) 70 to 20% by weight of diisopropylnaphthalene or a naphthalene mixture of not less than 97% by weight of diisopropylnaphthalene, not more than 1% by weight of monoisopropylnaphthalene and not more than 2% by weight of triisopropylnaphthalene, and a pressure-sensitive recording paper sheet prepared by using the solvent.
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: October 13, 1987
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshio Okada, Tadashi Nakamura, Youichi Ohhira
  • Solvent for chromogenic dye-precursor material for pressure-sensitive recording paper sheet and pressure-sensitive recording paper sheet prepared by using the solvent
    Patent number: 4699658
    Abstract: A solvent for chromogenic dye-precursor material for pressure-sensitive recording paper sheet, comprising 50 to 80% by weight of p-monoisopropylbiphenyl and 50 to 20% by weight of hydrogenated terphenyl, and a pressure-sensitive recording paper sheet prepared by using the solvent.
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: October 13, 1987
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshio Okada, Tadashi Nakamura, Youichi Ohhira