Patents by Inventor Kazuo Tsubuko

Kazuo Tsubuko 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: 7670742
    Abstract: It is an object of the present invention to provide a recording material which contains at least a colorant and a resin wherein the colorant contains silver, and a toner which contains at least a colorant and a resin wherein the colorant is an alloy containing silver, zinc and aluminum.
    Type: Grant
    Filed: March 14, 2006
    Date of Patent: March 2, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Yamazaki
  • Patent number: 7122287
    Abstract: An electrophotographic liquid developer includes a carrier liquid and toner particles. The toner particles include a colorant and a resin component and are dispersed in the carrier liquid. The resin component includes a polyester resin as a main component. When 0.3 g of the liquid developer is dropped on a filter paper (which is defined in JIS P 3801) from a point of 10 mm height, the carrier liquid diffuses in the filter paper at a speed not lower than 1 mm/minute.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: October 17, 2006
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Asami, Kazuo Tsubuko, Aiko Ishikawa
  • Publication number: 20060222985
    Abstract: It is an object of the present invention to provide a recording material which contains at least a colorant and a resin wherein the colorant contains silver, and a toner which contains at least a colorant and a resin wherein the colorant is an alloy containing silver, zinc and aluminum.
    Type: Application
    Filed: March 14, 2006
    Publication date: October 5, 2006
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Yamazaki
  • Patent number: 6939655
    Abstract: A liquid recording material containing at least a carrier liquid, a resin, a coloring agent, and a reactive silicone material, an image transfer sheet for use with the liquid recording material, and a method of fixing images, using the liquid recording material, are disclosed.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: September 6, 2005
    Assignee: Research Laboratories of Australia PTY Ltd.
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Publication number: 20040259015
    Abstract: A recording liquid including a colorant and a carrier liquid including at least a poly-&agr;-olefin. The recording liquid can be used as a liquid developer, an inkjet ink, a printing ink, a marker ink, an electronic recording ink, or the like. An image forming method including the steps of applying a recording liquid on a liquid bearing member to form a layer of the recording liquid; and developing an electrostatic latent image born on an image bearing member by bringing the layer of the recording liquid into contact with the image bearing member to form a visual image on the image bearing member.
    Type: Application
    Filed: June 16, 2004
    Publication date: December 23, 2004
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Patent number: 6692881
    Abstract: A recording liquid including a colorant and a carrier liquid including at least one of a liquid paraffin and a linear silicone oil. The recording liquid is an inkjet ink, a printing ink, a marker ink, a stencil ink, an electronic recording ink, a non-aqueous paint, a liquid developer or the like. When the recording liquid is a non-aqueous paint or a liquid developer, the recording ink further includes a resin.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: February 17, 2004
    Assignee: Ricoh Company Limited
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Publication number: 20040010075
    Abstract: A liquid recording material containing at least a carrier liquid, a resin, a coloring agent, and a reactive silicone material, an image transfer sheet for use with the liquid recording material, and a method of fixing images, using the liquid recording material, are disclosed.
    Type: Application
    Filed: July 2, 2003
    Publication date: January 15, 2004
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Publication number: 20040005510
    Abstract: An electrophotographic liquid developer includes a carrier liquid and toner particles. The toner particles include a colorant and a resin component and are dispersed in the carrier liquid. The resin component includes a polyester resin as a main component. When 0.3 g of the liquid developer is dropped on a filter paper (which is defined in JIS P 3801) from a point of 10 mm height, the carrier liquid diffuses in the filter paper at a speed not lower than 1 mm/minute.
    Type: Application
    Filed: July 2, 2003
    Publication date: January 8, 2004
    Inventors: Tsuyoshi Asami, Kazuo Tsubuko, Aiko Ishikawa
  • Patent number: 6620569
    Abstract: A liquid recording material containing at least a carrier liquid, a resin, a coloring agent, and a reactive silicone material, an image transfer sheet for use with the liquid recording material, and a method of fixing images, using the liquid recording material, are disclosed.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: September 16, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Publication number: 20030099894
    Abstract: A recording liquid including a colorant and a carrier liquid including at least one of a liquid paraffin and a linear silicone oil. The recording liquid is an inkjet ink, a printing ink, a marker ink, a stencil ink, an electronic recording ink, a non-aqueous paint, a liquid developer or the like. When the recording liquid is a non-aqueous paint or a liquid developer, the recording ink further includes a resin.
    Type: Application
    Filed: May 30, 2002
    Publication date: May 29, 2003
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Publication number: 20030065064
    Abstract: A liquid recording material containing at least a carrier liquid, a resin, a coloring agent, and a reactive silicone material, an image transfer sheet for use with the liquid recording material, and a method of fixing images, using the liquid recording material, are disclosed.
    Type: Application
    Filed: June 12, 2002
    Publication date: April 3, 2003
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Patent number: 6522852
    Abstract: An image forming process wherein a latent image-bearing surface of a supporting member is contacted with a toner-containing liquid developer to develop the latent image with the liquid developer and to form a toner image covered with a layer of the liquid developer. The toner image-bearing surface is treated with a squeezing member to squeeze the liquid developer layer therefrom. The toner image-bearing surface is then treated with a voltage impressing member to impart a bias voltage to the toner image. The toner image is transferred from the surface to an intermediate transfer medium and then to a transfer medium.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: February 18, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Tuyoshi Asami
  • Patent number: 6447973
    Abstract: A liquid developer containing a carrier liquid containing silicone oil, and toner particles dispersed in the carrier liquid and each containing a coloring agent and a resin, the resin contains at least one member selected from the group consisting of the following resins (a)-(g): (a): rosin polymers having a softening point of 50-190° C., a glass transition point of 10-170° C. and a molecular weight of 2,000-40,000 and obtained by reacting (a1) a rosin glycidyl ester, (a2) dicarboxylic acid or dicarboxylic anhydride, (a3) at least one crosslinking agent selected from the group consisting of polyfunctional epoxy compounds, tri- or more polybasic acids or anhydrides thereof tri- or more polyhydric alcohols, and (a4) a dihydric alcohol; (b): vinyl polymers having a ratio of the weight average molecular weight to the number average molecular weight of greater than 4; (c): olefin resins having a melt index of 2.5-700; (d): polyolefins or polyolefin copolymers having an acid value of 0.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: September 10, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Asami, Kazuo Tsubuko, Aiko Ishikawa, Akihiro Koseki, Takeo Kudoh, Kazuhiko Umemura
  • Publication number: 20020081515
    Abstract: A liquid recording material containing at least a carrier liquid, a resin, a coloring agent, and a reactive silicone material, an image transfer sheet for use with the liquid recording material, and a method of fixing images, using the liquid recording material, are disclosed.
    Type: Application
    Filed: August 30, 2001
    Publication date: June 27, 2002
    Inventors: Kazuo Tsubuko, Tsuyoshi Asami, Aiko Ishikawa
  • Patent number: 6020103
    Abstract: A liquid toner for use in a liquid developer contains a dispersion medium and toner particles, each of which toner particles contains a coloring agent and a binder agent and is dispersed in the dispersion medium, the toner particles comprising small toner particles with a particle diameter of 0.1 .mu.m or less in an amount of 20 wt. % or less of the total weight of the toner particles, and having an average particle diameter of 0.3 to 5 .mu.m. Using the above-mentioned liquid toner in which the amount of the toner particles is controlled to 5 to 100 wt. % of the total weight of the liquid toner, a latent electrostatic image formed on a photoconductor can be developed to a toner image.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: February 1, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Akihiko Gotoh, Tsuyoshi Asami, Yukio Tabata
  • Patent number: 5952048
    Abstract: An ink composition contains a carrier medium and charged particles containing a coloring agent, which ink composition satisfies at least one condition of condition A or B: condition A that the specific charge quantity of the charged particles is in a range of 10 to 1,000 .mu.C/g with a positive or negative polarity; and condition B that the specific resistance of the ink composition is 10.sup.10 .OMEGA.cm or more; and ink-jet recording methods using the ink composition are proposed.
    Type: Grant
    Filed: July 22, 1997
    Date of Patent: September 14, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Nobutaka Kinoshita, Tsuyoshi Asami, Akihiko Gotoh, Kazuhiko Umemura, Kazuyo Mizuno, Makoto Okawara
  • Patent number: 5851717
    Abstract: A developer for use in electrophotography for developing latent electrostatic images to visible toner images, includes at least two kinds of toner particles with different shapes selected from the group consisting of spherical toner particles, fibrous toner particles and amorphous toner particles, each toner particle containing a coloring agent and a binder resin. There is provided a liquid developer including a toner which is dispersed in a carrier liquid, in which the toner includes at least two kinds of the above-mentioned toner particles with different shapes. An electrophotographic image formation method using the above-mentioned liquid developer is also provided.
    Type: Grant
    Filed: April 24, 1996
    Date of Patent: December 22, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Akihiko Gotoh, Tsuyoshi Asami, Kazuyo Mizuno, Akihiro Koseki
  • Patent number: 5759733
    Abstract: A liquid developer for use in electrophotography is disclosed, which comprises (i) a toner comprising as the main toner components a colorant, a resin, and a polyolefin resin having an acid value of from 5 to 50 and a melt viscosity at 200.degree. C. of from 100 to 15,000 cps, and (ii) a carrier liquid in which the toner is dispersed. The polyolefin resin and the colorant in the liquid developer may constitute an integral flushing colorant which is prepared by subjecting the resin and the colorant to flushing processing.
    Type: Grant
    Filed: January 13, 1992
    Date of Patent: June 2, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Shinichi Kuramoto, Toshiki Nanya, Kazuhiko Umemura, Kayoko Nagai
  • Patent number: 5189102
    Abstract: A method for producing a vinyl resin comprising the steps of dissolving or dispersing a polymerizable vinyl monomer in a polymerization solvent containing a silicone oil, and polymerizing the polymerizable vinyl monomer in the presence of a polymerization catalyst.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: February 23, 1993
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Shinichi Kuramoto, Kazuhiko Umemura, Hidemi Uematsu, Okawara, Makoto
  • Patent number: 5169739
    Abstract: A liquid developer comprises an aliphatic hydrocarbon carrier liquid and a toner dispersed in the carrier liquid, which toner comprises a coloring agent and a resin component, wherein a solid toner component which is obtained by evaporating the liquid developer to dryness has a softening point of 60.degree. C. to 90.degree. C. and flow-initiating point of 110.degree. C. to 160.degree. C.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: December 8, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuhiko Umemura, Kazuo Tsubuko, Shinichi Kuramoto, Toshihiko Takahashi, Hidemi Uematsu