Patents by Inventor Tsuyoshi Asami

Tsuyoshi Asami 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: 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