Patents by Inventor Yoshihiro Suguro

Yoshihiro Suguro 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: 6790575
    Abstract: A two component developer comprising a magnetic toner containing a binder resin and a magnetic particle, and a magnetic carrier containing a magnetic particle, wherein the magnetic toner has an average particle diameter of 4.0 to 10.0 &mgr;m, and contains 5 to 80 No. % of toner particles having particle diameter of 5 &mgr;m or less, and exhibits magnetization of 10 to 25 emu/g under magnetic field of 5 kiloersteds.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: September 14, 2004
    Assignee: Ricoh Company, Ltd.
    Inventors: Fumihiro Sasaki, Hiroaki Matsuda, Bing Shu, Maiko Kondo, Hiroshi Nakai, Hiroto Higuchi, Yasuaki Iwamoto, Yoshihiro Suguro, Hiroyuki Yoshikawa, Masahide Yamashita, Kazuyuki Yazaki
  • Publication number: 20030073021
    Abstract: A two component developer comprising a magnetic toner containing a binder resin and a magnetic particle, and a magnetic carrier containing a magnetic particle, wherein the magnetic toner has an average particle diameter of 4.0 to 10.0 &mgr;m, and contains 5 to 80 No. % of toner particles having particle diameter of 5 &mgr;m or less, and exhibits magnetization of 10 to 25 emu/g under magnetic field of 5 kiloersteds.
    Type: Application
    Filed: March 21, 2002
    Publication date: April 17, 2003
    Inventors: Fumihiro Sasaki, Hiraoki Matsuda, Bing Shu, Maiko Kondo, Hiroshi Nakai, Hiroto Higuchi, Yasuaki Iwamoto, Yoshihiro Suguro, Hiroyuki Yoshikawa, Masahide Yamashita, Kazuyuki Yazaki
  • Patent number: 6503676
    Abstract: A toner including a binder resin; a colorant; and an external additive, wherein the external additive includes a particulate inorganic material, and a silicone oil, wherein the silicone oil is present on the particulate inorganic material in an amount of Ws by weight and present as a free silicone oil in an amount of Wfs by weight, and a free silicone degree defined as a ratio Wfs/Ws is from 10 to 70%.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: January 7, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Yamashita, Tomio Kondou, Hideki Sugiura, Hachiroh Tosaka, Osamu Uchinokura, Hitoshi Ueda, Yoshihiro Suguro
  • Patent number: 6432590
    Abstract: A toner including toner particles including at least a binder resin having a first melting point and a first solubility parameter, a colorant and a particulate release agent having a second melting point lower than the first melting point and a second solubility parameter different from the first solubility parameter, wherein the particulate release agent dispersed in the toner particles has an average needle-shape degree LD/SD of not less than 1.6, where LD is a diameter of a particle of the release agent dispersed in the toner in a major axis direction thereof and SD is a diameter of the particle in a minor axis direction.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: August 13, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideyuki Ueda, Shohichi Sugimoto, Satoru Miyamoto, Osamu Uchinokura, Kumi Hasegawa, Tamotsu Kajihara, Yoshihiro Suguro, Noboru Kuroda
  • Patent number: 6347823
    Abstract: In a vehicle front end panel, a horn cover for defining a passage of sound generated by a horn is formed integrally with a panel body to which a front end member such as a radiator is assembled. Further, the panel body and at least a part of the horn cover are integrally molded by resin. Therefore, the horn structure including the horn and the horn cover is readily manufactured in a low cost.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: February 19, 2002
    Assignee: Denso Corporation
    Inventors: Ikuo Ozawa, Norihisa Sasano, Noriaki Maeda, Toshiki Sugiyama, Isao Hara, Yoshihiro Suguro, Takuya Usami
  • Publication number: 20010051270
    Abstract: A toner including a binder resin; a colorant; and an external additive, wherein the external additive includes a particulate inorganic material, and a silicone oil, wherein the silicone oil is present on the particulate inorganic material in an amount of Ws by weight and present as a free silicone oil in an amount of Wfs by weight, and a free silicone degree defined as a ratio Wfs/Ws is from 10 to 70%.
    Type: Application
    Filed: April 26, 2001
    Publication date: December 13, 2001
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hiroshi Yamashita, Tomio Kondou, Hideki Sugiura, Hachiroh Tosaka, Osamu Uchinokura, Hitoshi Ueda, Yoshihiro Suguro
  • Patent number: 5614347
    Abstract: A toner for developing latent electrostatic images including a resin component, with the image fixing temperature of the toner being in the range of 100.degree. to 140.degree. C., and the penetration of the toner, measured when allowed to stand at 60.degree. C. for 4 hours in accordance with Japanese Industrial Standards (JIS) K 2235, being 5 mm or more. The resin component for the toner may include a hydrogenated petroleum resin with a hydrogenation ratio of 50% or more, and optionally polyester resin.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: March 25, 1997
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuo Aoki, Tetsuo Isoda, Masanori Suzuki, Yoshihiro Suguro
  • Patent number: 5565298
    Abstract: A method of producing a toner for developing latent electrostatic images is disclosed, which comprises the steps of dispersing resin particles comprising a resin in an organic solvent in which the resin is not dissolved; dissolving a dye in the organic solvent before or after dispersing the resin particles in the organic solvent to prepare a dispersion in which the resin particles and the dye are contained, thereby dying the resin particles with the dye; and removing the organic solvent from the dispersion, wherein the ratio of the solubility [D.sub.1 ] of the dye in the organic solvent to the solubility [D.sub.2 ] of the dye in the resin of the resin particles, [D.sub.1 ]/[D.sub.2 ], is not more than 0.5.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: October 15, 1996
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Suguro, Masaki Takatsugi, Hiroshi Yamashita, Kenkichi Muto, Kazumi Ohtaki, Yoshikazu Kaneko, Takayuki Hoshina
  • Patent number: 5380616
    Abstract: A toner for developing latent electrostatic images composed of a continuous phase containing a binder resin, and a disperse phase dispersed in the form of finely-divided disperse phases in the continuous phase, containing a resin which is not the same as the binder resin for use in the continuous phase, and finely-divided particles of a releasing agent which are dispersed in the resin, with a coloring agent being dispersed in the continuous phase and/or the disperse phase.
    Type: Grant
    Filed: December 1, 1992
    Date of Patent: January 10, 1995
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuo Aoki, Yoshihiro Suguro, Tomio Kondo, Yasushi Nakamura, Satoru Miyamoto
  • Patent number: 4575479
    Abstract: A diazo-type thermosensitive recording material comprising a support material, a thermosensitive coloring layer formed thereon, which thermosensitive coloring layer comprises a diazonium compound layer containing a diazonium compound, and a coupler layer containing a coupler, and of the diazonium compound layer and the coupler layer, at least the lower layer near the support material further containing a thermo-fusible material and a water-insoluble binder agent, and in any portions other than the diazonium compound layer of the thermosensitive recording material, an imidazole derivative of the following formula being contained: ##STR1## wherein R.sup.1 represents a higher alkyl group, preferably with 6 to 24 carbon atoms, an alkoxyl or hydroxyalkyl group derived from the above higher alkyl group; R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen, a phenyl group, a benzyl group, an alkyl group, an alkoxyl group, an hydroxyalkyl group or a cyanoalkyl group.
    Type: Grant
    Filed: June 10, 1983
    Date of Patent: March 11, 1986
    Assignee: Ricoh Company, Ltd.
    Inventors: Masanaka Nagamoto, Yoshihiro Suguro
  • Patent number: 4542394
    Abstract: A diazo-type thermosensitive recording material is disclosed, which comprises a support material, and at least two layers formed thereon, one of the layers being a diazonium compound layer comprising at least a diazonium compound, and another of the layers being a coupler layer comprising at least a coupler capable of reacting with the diazonium compound to form a dye, and a benzimidazole derivative having a substituent at the 1-position thereof.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: September 17, 1985
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Suguro, Masanaka Nagamoto
  • Patent number: 4454521
    Abstract: A diazo-type thermosensitive recording material comprising a diazo-type thermosensitive coloring layer formed on a support material, the diazo-type thermosensitive coloring layer comprising a diazo compound, a coupler capable of forming an azo dye in the reaction between the diazo compound and the coupler, and a petroleum resin with a melting or softening point ranging from 50.degree. C. to 150.degree. C., and with the addition of auxiliary components for improving the properties of the thermosensitive recording material.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: June 12, 1984
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Suguro, Masanaka Nagamoto, Takanori Motosugi, Yoshihiko Hotta, Toshiyuki Watanabe