Patents by Inventor Yoshiaki Matsunaga

Yoshiaki Matsunaga 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).

  • Patent number: 8268746
    Abstract: Provided is a thermosensitive recording material which can be produced through high-speed coating, which is excellent in head-matching property, and which can provide a printed image having good waterproofness, while maintaining high sensitivity and high storage stability, which material includes a support, an under layer laid over the support, the under layer containing a plastic hollow particle, a thermosensitive color-developing layer laid over the under layer, the thermosensitive color-developing layer containing a leuco dye and a developer, wherein two or more layers including the thermosensitive color-developing layer are formed through simultaneous coating by a curtain coating method.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: September 18, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Motoi Orihara, Tomohisa Kakuda, Yoshiaki Matsunaga, Eiji Fukui
  • Patent number: 8147905
    Abstract: To provide a heat-sensitive recording material, including: a substrate; a heat-sensitive color developing layer on the substrate, the heat-sensitive color developing layer containing at least a leuco dye and a developer; and a protective layer on the heat-sensitive color developing layer, the protective layer containing at least a binder resin, wherein the binder resin in the protective layer contains diacetone-modified polyvinyl alcohol resin, the degree of polymerization of the binder resin in the protective layer is 1,000 to 1,800 and the degree of saponification of the binder resin is 90% or greater and less than 98%.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: April 3, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiaki Matsunaga, Shinji Takano, Kazuyuki Uetake
  • Patent number: 8097560
    Abstract: The present invention provides a heat-sensitive recording material with enhanced color developing sensitivity maintaining heat resistance and image storage stability characteristics such as plasticizer resistance and water resistance. The present invention provides a heat-sensitive recording material including at least a substrate and a heat-sensitive color developing layer containing a leuco dye and developers on the front surface of the substrate, wherein as the developers 4-hydroxy-4?-allyloxydiphenyl sulfone is used in combination with a first diphenyl compound represented by formula (1) and/or a second diphenyl compound represented by formula (2).
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: January 17, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiaki Matsunaga, Yoshikazu Kaneko
  • Patent number: 8008229
    Abstract: To provide a thermosensitive recording material, which contains: a base; a thermosensitive coloring layer containing a leuco dye and a color developer; at least one protective layer containing a resin, a crosslinking agent, and wax, wherein the thermosensitive coloring layer is disposed on the base, and the protective layer is disposed on the thermosensitive coloring layer, and wherein the resin is reactive carbonyl group-containing polyvinyl alcohol, the crosslinking agent is a hydrazide compound, and the wax is oxidized polyethylene wax.
    Type: Grant
    Filed: August 2, 2010
    Date of Patent: August 30, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiaki Ikeda, Hiroaki Matsui, Yoshitaka Sano, Yoshiaki Matsunaga, Yuhei Fujimoto
  • Patent number: 8003568
    Abstract: Provided is a thermosensitive recording material that comprises a support, a thermosensitive coloring layer on the support, and a protective layer on the thermosensitive coloring layer, wherein the thermosensitive coloring layer comprises a leuco dye and a color developer, and the protective layer comprises a diacetone-modified polyvinyl alcohol resin and a (meth)acrylic resin.
    Type: Grant
    Filed: September 12, 2007
    Date of Patent: August 23, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiaki Matsunaga, Shinji Takano, Takeshi Kajikawa, Toshiaki Ikeda, Masafumi Kumoda
  • Patent number: 7968494
    Abstract: A heat-sensitive recording material including: a substrate; a heat-sensitive color developing layer over the substrate, the heat-sensitive color developing layer composed mainly of a leuco dye and a color developer that develops color of the leuco dye upon heating; and a protective layer over the heat-sensitive color developing layer, the protective layer composed mainly of a water-soluble resin and a crosslinking agent, wherein the protective layer contains diacetone-modified polyvinyl alcohol as the water-soluble resin, and N-aminopolyacrylamide as the crosslinking agent.
    Type: Grant
    Filed: September 12, 2007
    Date of Patent: June 28, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Shinji Takano, Yoshiaki Matsunaga
  • Publication number: 20110135830
    Abstract: To provide a heat-sensitive recording material, including: a substrate; a heat-sensitive color developing layer on the substrate, the heat-sensitive color developing layer containing at least a leuco dye and a developer; and a protective layer on the heat-sensitive color developing layer, the protective layer containing at least a binder resin, wherein the binder resin in the protective layer contains diacetone-modified polyvinyl alcohol resin, the degree of polymerization of the binder resin in the protective layer is 1,000 to 1,800 and the degree of saponification of the binder resin is 90% or greater and less than 98%.
    Type: Application
    Filed: February 4, 2011
    Publication date: June 9, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yoshiaki Matsunaga, Shinji Takano, Kazuyuki Uetake
  • Patent number: 7906458
    Abstract: To provide a heat-sensitive recording material, including: a substrate; a heat-sensitive color developing layer on the substrate, the heat-sensitive color developing layer containing at least a leuco dye and a developer; and a protective layer on the heat-sensitive color developing layer, the protective layer containing at least a binder resin, wherein the binder resin in the protective layer contains diacetone-modified polyvinyl alcohol resin, the degree of polymerization of the binder resin in the protective layer is 1,000 to 1,800 and the degree of saponification of the binder resin is 90% or greater and less than 98%.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: March 15, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiaki Matsunaga, Shinji Takano, Kazuyuki Uetake
  • Publication number: 20110033642
    Abstract: To provide a thermosensitive recording material, which contains: a base; a thermosensitive coloring layer containing a leuco dye and a color developer; at least one protective layer containing a resin, a crosslinking agent, and wax, wherein the thermosensitive coloring layer is disposed on the base, and the protective layer is disposed on the thermosensitive coloring layer, and wherein the resin is reactive carbonyl group-containing polyvinyl alcohol, the crosslinking agent is a hydrazide compound, and the wax is oxidized polyethylene wax.
    Type: Application
    Filed: August 2, 2010
    Publication date: February 10, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventors: Toshiaki Ikeda, Hiroaki Matsui, Yoshitaka Sano, Yoshiaki Matsunaga, Yuhei Fujimoto
  • Publication number: 20100062936
    Abstract: Provided is a thermosensitive recording material which can be produced through high-speed coating, which is excellent in head-matching property, and which can provide a printed image having good waterproofness, while maintaining high sensitivity and high storage stability, which material includes a support, an under layer laid over the support, the under layer containing a plastic hollow particle, a thermosensitive color-developing layer laid over the under layer, the thermosensitive color-developing layer containing a leuco dye and a developer, wherein two or more layers including the thermosensitive color-developing layer are formed through simultaneous coating by a curtain coating method.
    Type: Application
    Filed: September 9, 2009
    Publication date: March 11, 2010
    Applicant: RICOH COMPANY, LTD.
    Inventors: Motoi Orihara, Tomohisa Kakuda, Yoshiaki Matsunaga, Eiji Fukui
  • Publication number: 20080280757
    Abstract: Provided is a thermosensitive recording material that comprises a support, a thermosensitive coloring layer on the support, and a protective layer on the thermosensitive coloring layer, wherein the thermosensitive coloring layer comprises a leuco dye and a color developer, and the protective layer comprises a diacetone-modified polyvinyl alcohol resin and a (meth)acrylic resin.
    Type: Application
    Filed: September 12, 2007
    Publication date: November 13, 2008
    Inventors: Yoshiaki Matsunaga, Shinji Takano, Takeshi Kajikawa, Toshiaki Ikeda, Masafumi Kumoda
  • Publication number: 20080220969
    Abstract: The present invention provides a heat-sensitive recording material with enhanced color developing sensitivity maintaining heat resistance and image storage stability characteristics such as plasticizer resistance and water resistance. The present invention provides a heat-sensitive recording material including at least a substrate and a heat-sensitive color developing layer containing a leuco dye and developers on the front surface of the substrate, wherein as the developers 4-hydroxy-4?-allyloxydiphenyl sulfone is used in combination with a first diphenyl compound represented by formula (1) and/or a second diphenyl compound represented by formula (2).
    Type: Application
    Filed: March 6, 2008
    Publication date: September 11, 2008
    Applicant: Ricoh Company, Ltd.
    Inventors: Yoshiaki Matsunaga, Yoshikazu Kaneko
  • Publication number: 20080146443
    Abstract: To provide a heat-sensitive recording material, including: a substrate; a heat-sensitive color developing layer on the substrate, the heat-sensitive color developing layer containing at least a leuco dye and a developer; and a protective layer on the heat-sensitive color developing layer, the protective layer containing at least a binder resin, wherein the binder resin in the protective layer contains diacetone-modified polyvinyl alcohol resin, the degree of polymerization of the binder resin in the protective layer is 1,000 to 1,800 and the degree of saponification of the binder resin is 90% or greater and less than 98%.
    Type: Application
    Filed: September 13, 2007
    Publication date: June 19, 2008
    Inventors: Yoshiaki Matsunaga, Shinji Takano, Kazuyuki Uetake
  • Publication number: 20080096762
    Abstract: A heat-sensitive recording material including: a substrate; a heat-sensitive color developing layer over the substrate, the heat-sensitive color developing layer composed mainly of a leuco dye and a color developer that develops color of the leuco dye upon heating; and a protective layer over the heat-sensitive color developing layer, the protective layer composed mainly of a water-soluble resin and a crosslinking agent, wherein the protective layer contains diacetone-modified polyvinyl alcohol as the water-soluble resin, and N-aminopolyacrylamide as the crosslinking agent.
    Type: Application
    Filed: September 12, 2007
    Publication date: April 24, 2008
    Inventors: Shinji Takano, Yoshiaki Matsunaga
  • Patent number: 4664507
    Abstract: An electrographic printer/copier includes a paper path which is easily accessed from the top of the machine and permits copies to be collated automatically. The machine includes a paper tray which adjusts to organize successive pages into related reports.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: May 12, 1987
    Assignee: Kentek Information Systems, Inc.
    Inventors: Kensuke Fukae, Shozo Kaieda, Yoshiaki Matsunaga
  • Patent number: 4066540
    Abstract: An apparatus for continuous froth flotation is disclosed which comprises a vertically elongate column having disposed therein a froth separator, a raw water inlet pipe, a treated water discharge pipe and a gas dispersing unit, and stepped shelves disposed inside said column and adapted to provide thorough contact between the bubbles and the water subjected to treatment.
    Type: Grant
    Filed: October 28, 1976
    Date of Patent: January 3, 1978
    Assignee: Agency of Industrial Science & Technology
    Inventors: Shinji Wada, Yoshiaki Matsunaga, Michihiro Noda