Patents by Inventor Takahiro Honda

Takahiro Honda 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: 8034526
    Abstract: A method for manufacturing a toner, including: dissolving or dispersing toner constituents including a resin, a colorant, a release agent, and a graft polymer including a polyolefin resin unit and a vinyl resin unit in a solvent, to prepare a toner constituent liquid; supplying the toner constituent liquid to a retention part configured to retain the toner constituent liquid; discharging the toner constituent liquid from the retention part to a granulation space through plural holes arranged on the retention part, while exciting the toner constituent liquid by a vibration means in contact with a part of the retention part, so that the discharged columnar toner constituent liquid is constricted to form liquid droplets; and converting the liquid droplets into solid toner particles; together with a toner manufactured by the above method.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: October 11, 2011
    Assignee: Ricoh Company Limited
    Inventors: Yohichiroh Watanabe, Shinji Ohtani, Yoshihiro Norikane, Yasuaki Iwamoto, Yasutada Shitara, Kazumi Suzuki, Takahiro Honda
  • Patent number: 8007976
    Abstract: A toner is provided that comprises a colorant and a binder resin, wherein the binder resin comprises a polyester resin that is prepared by a polycondensation reaction in the presence of at least a titanium-containing catalyst expressed by General Formula (II) or (II), the toner has a volume average particle diameter of 2.0 ?m to 10.0 ?m and a ratio Dv/Dn within a range of 1.00 to 1.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: August 30, 2011
    Assignee: Ricoh Company. Ltd.
    Inventors: Hideki Sugiura, Hiroyuki Fushimi, Osamu Uchinokura, Takahiro Honda, Masami Tomita, Hyo Shu, Ken Umehara
  • Publication number: 20110200928
    Abstract: A method for producing a toner, including: dispersing toner particles containing at least a binder resin in a first aqueous medium so as to produce an aqueous dispersion; and subjecting the aqueous dispersion to heat treatment, wherein the electric conductivity of the aqueous dispersion after the heat treatment is higher than the electric conductivity of the aqueous dispersion before the heat treatment by 50 ?S/cm or less.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 18, 2011
    Inventors: Masaki WATANABE, Osamu Uchinokura, Tsuneyasu Nagatomo, Takahiro Honda, Ryuta Chiba
  • Publication number: 20110124646
    Abstract: A method of treating a disease associated with angiogenesis by administering a therapeutically effective amount of a compound represented by the formula (1) or a salt thereof wherein the ring X represents R1 and R2 independently represent a hydrogen atom, an alkyl, an aryl or an aromatic heterocyclic; R3 represents a hydrogen atom, a halogen atom, a hydroxy, an alkoxy, an aryloxy, an alkyl, an aryl, an amino, an alkylamino, a cycloalkylamino, an arylamino, an alkylcarbonylamino, an arylcarbonylamino, a mercapto, an alkylthio, an arylthio, an alkylsulfinyl or a nonaromatic heterocyclic; A1 represents a sulfur atom, a sulfinyl or a sulfonyl; and A2 represents an alkylene.
    Type: Application
    Filed: January 24, 2011
    Publication date: May 26, 2011
    Applicant: SANTEN PHARMACEUTICAL CO., LTD.
    Inventors: Hisashi Tajima, Takahiro Honda, Kenji Kawashima, Kazuyoshi Okamoto, Minoru Yamamoto
  • Patent number: 7939235
    Abstract: A toner includes a polyol-based resin having multiple hydroxyl groups in a molecular chain thereof in which a ratio of epoxy group to hydroxyl group is from 0.990 to 1.010. A stirring and transfer device satisfies 1000000??×?×??16000000, wherein ? represents a number of rotation per minute, ? (mm) represents a pitch and ? (mm) represents a transfer path length of the stirring and transfer device. A temperature Tin (° C.) in a development device during stirring and transfer of a two component developing agent satisfies 3020 C.<Tin<60° C., and the toner satisfies Y??0.5X+45, 5?X<40, 5?Y?35, wherein X (%) represents a degree of agglomeration of a mother toner particle and Y (%) represents a degree of agglomeration of the toner which has been preserved at 55° C. for 24 hours.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: May 10, 2011
    Assignee: Ricoh Company Limited
    Inventors: Takahiro Honda, Hiroyuki Fushimi, Fumihiro Sasaki, Hisashi Nakajima, Hiroshi Yamada, Yasuo Asahina
  • Patent number: 7935469
    Abstract: Disclosed is a developer containing toner and carrier, the toner containing as a binder resin a polyol resin having a plurality of OH groups in a molecule chain having an EX/OH ratio between epoxy groups (EX) and OH groups (OH) of 0.990 to 1.010. The rotational speed ?, pitch ? and conveyance path length ? of an stirring and conveying unit satisfies 1.0×106??×?×??16.0×106. Toner base particles having an electrostatic property satisfies 1.5<[QB/M3600]/[QB/M180]<2.5, toner having an electrostatic property satisfies 0.7<[QT/M3600]/[QT/M180]<1.3, the external additive comprises two types of fine inorganic particles having different resistance values, wherein the particle size distribution Y and added amount X of the fine inorganic particles with smaller resistance satisfy 0.1?x?2.0, and Y?2.6×10?3X+0.0048.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: May 3, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Takahiro Honda, Hiroyuki Fushimi, Fumihiro Sasaki, Hisashi Nakajima, Yasuo Asahina
  • Publication number: 20110081608
    Abstract: A transparent toner for electrophotographic image forming method forming an image on a recording medium with one or more chromatic toner and a transparent toner, including a thermoplastic resin; and a lubricant, wherein the transparent toner has a tangent loss (tan ?) determined by the following formula has a maximum peak value not less than 3 in a range of from 80 to 160° C.: tangent loss (tan ?)=loss elastic modulus (G?) of the transparent toner/storage modulus (G?) thereof.
    Type: Application
    Filed: September 29, 2010
    Publication date: April 7, 2011
    Inventors: Shigenori Yaguchi, Shinya Nakayama, Hideyuki Santo, Takahiro Honda
  • Patent number: 7906511
    Abstract: The present invention has its object to study synthesis of novel cyclic compounds having a pyrimidinylalkylthio group and to find pharmacological actions of the compounds. According to the present invention, a compound represented by the formula (1) or a salt thereof is provided. In the formula, the ring X represents: R1 and R2 independently represent a hydrogen atom, an alkyl group, an aryl group, an aromatic heterocyclic group or the like; R3 represents a hydrogen atom, a halogen atom, a hydroxy group, an alkoxy group, an aryloxy group, an alkyl group, an aryl group, an amino group, an alkylamino group or the like; A1 represents a sulfur atom or the like; and A2 represents an alkylene group.
    Type: Grant
    Filed: March 31, 2006
    Date of Patent: March 15, 2011
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Hisashi Tajima, Takahiro Honda, Kenji Kawashima, Kazuyoshi Okamoto, Minoru Yamamoto
  • Patent number: 7897774
    Abstract: The present invention relates to a synthesis study of novel cyclic compounds having a quinolylalkylthio group represented by the formula (1), and pharmacological actions of the compounds. In the formula, the ring X represents: which may have halogen and/or alkyl; R1 and R2 independently represent hydrogen, alkyl, cycloalkyl, aryl or a (non) aromatic heterocycle; R3 represents qinolyl; A represents sulfur, sulfinyl or sulfonyl; and B represents alkylene.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: March 1, 2011
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Kenji Kawashima, Takahiro Honda, Hisashi Tajima, Kazuyoshi Okamoto, Minoru Yamamoto
  • Publication number: 20100297548
    Abstract: A method for producing resin particles, including ejecting a liquid containing at least a resin in the form of droplets from a droplet ejecting unit having a plurality of holes provided in a part of a flow channel for feeding the liquid containing at least a resin, and drying and solidifying the ejected droplets so as to obtain the resin particles, while the ejected droplets are transported by a primary transport air flow flowing in the direction in which the droplets are ejected, wherein the ejected droplets are further transported by a secondary transport air flow which transports the ejected droplets in a different direction from a direction in which the primary transport air flow flows, and wherein a smaller angle of angles formed between a velocity vector of the primary transport air flow and a velocity vector of the secondary transport air flow is less than 120 degrees.
    Type: Application
    Filed: May 21, 2010
    Publication date: November 25, 2010
    Inventors: Takahiro Honda, Yohichiroh Watanabe, Yasutada Shitara, Yoshihiro Norikane
  • Publication number: 20100233609
    Abstract: The present invention relates to toner compositions containing: toner particles made of: binder resin; colorant; and a wax which is dispersed in the toner particles, where the toner composition satisfies relationship (2): B?394?400A? when 0.950<A??0.965 (2) where A? represents an average circularity of the toner composition, B represents a content of toner particles having a particle diameter not greater than 3 ?m expressed in % by number, and a concentration of the wax at a surface of the toner particles is larger than a concentration thereof in the center of the toner particles.
    Type: Application
    Filed: April 7, 2010
    Publication date: September 16, 2010
    Inventors: Hiroto HIGUCHI, Fumihiro Sasaki, Shinichiro Yagi, Shigeru Emoto, Junichi Awamura, Naohito Shimota, Masami Tomita, Toshiki Nanya, Takahiro Honda, Maiko Kondo
  • Patent number: 7738819
    Abstract: An image forming apparatus including an image bearing member and a developing device configured to develop an electrostatic image on the image bearing member with a toner to form a toner image thereon and including a developing unit configured to develop the electrostatic image, and a toner cartridge configured to supply the toner to the developing unit through at least one opening, wherein the developing device circulates the toner between the toner cartridge and the developing unit through the at least one opening, and wherein the internal temperature of the hopper is higher than that of the cartridge and the ratio of a charge quantity distribution parameter of the toner under a condition of 45° C. and 54% RH to that under a condition of 25° C. and 54% RH is greater than 0.9 and less than 1.5.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: June 15, 2010
    Assignee: Ricoh Company Limited
    Inventors: Takahiro Honda, Hiroyuki Fushimi, Shuuichi Endoh, Masato Iio, Shinya Tanaka
  • Patent number: 7736826
    Abstract: A toner composition including toner particles including at least a binder resin; and a colorant, wherein the toner composition satisfies at least one of the following relationships (1) and (2): B?14 when 155<A?180; and B?0.6A?79 when 145?A?155,??(1) wherein A represents a shape factor SF-1 of the toner composition and B represents a content of toner particles having a particle diameter not greater than 3 ?m; and B?14 when 0.920?A??0.950; and B?394?400A? when 0.950<A??0.965??(2) wherein A? represents an average circularity of the toner composition and B represents a content of toner particles having a particle diameter not greater than 3 ?m.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: June 15, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroto Higuchi, Fumihiro Sasaki, Shinichiro Yagi, Shigeru Emoto, Junichi Awamura, Naohito Shimota, Masami Tomita, Toshiki Nanya, Takahiro Honda, Maiko Kondo
  • Publication number: 20100104970
    Abstract: A method and an apparatus for producing toner are provided. A fluid comprising a resin and a colorant is supplied to a retention member that includes a film on which multiple discharge openings are formed. The fluid which is supplied to the retention member is resonated so that liquid droplets thereof are discharged from the multiple openings. The liquid droplets which are discharged from the multiple openings are solidified to form mother particles of a toner.
    Type: Application
    Filed: October 23, 2009
    Publication date: April 29, 2010
    Inventors: Yoshihiro Norikane, Shinji Aoki, Masaru Ohgaki, Yohichiroh Watanabe, Takahiro Honda, Andrew Mwaniki Mulwa, Yuko Sekiguchi
  • Publication number: 20100055590
    Abstract: A method for producing a toner including periodically forming and discharging liquid droplets of a toner composition liquid containing at least a resin, a releasing agent and a colorant from a plurality of nozzles formed in a thin film which is provided in a reservoir for the toner composition liquid, by vibrating the thin film using a mechanically vibrating unit, and forming toner particles by solidifying the liquid droplets, wherein the forming toner particles comprises primarily drying the liquid droplets under a stream of dry gas containing an organic solvent whose partial pressure is equal to or higher than 1/10 of a saturated vapor pressure thereof but is equal to or lower than the saturated vapor pressure, the saturated vapor pressure being that at a drying temperature; and secondarily drying the primarily dried liquid droplets for solidification while the organic solvent is being evaporated.
    Type: Application
    Filed: August 31, 2009
    Publication date: March 4, 2010
    Inventors: Takahiro HONDA, Yohichiroh Watanabe, Kazumi Suzuki
  • Publication number: 20100021209
    Abstract: A toner produced by dissolving or dispersing toner components comprising a binder resin, a colorant, and a charge controlling agent in an organic solvent to prepare a toner components liquid, forming liquid droplets of the toner components liquid in a gas phase, and solidifying the liquid droplets into toner particles of the toner. The charge controlling agent includes a polycondensation reaction product of a phenol with an aldehyde.
    Type: Application
    Filed: July 15, 2009
    Publication date: January 28, 2010
    Inventors: Yohichiro WATANABE, Kazumi Suzuki, Takahiro Honda, Shinji Ohtani, Yoshihiro Norikane
  • Publication number: 20100016354
    Abstract: The present invention relates to Compounds represented by the formula (I) or salts thereof. In the formula (I), the ring A represents a benzene ring, a thiophene ring, or a pyridine ring; Ra represents a hydrogen atom, a halogen atom, an alkyl group, or an alkoxy group; the ring B represents a pyridine ring, a pyrimidine ring, or a quinoline ring; the ring C represents a benzene ring; a pyridine ring, a quinoline ring, or an isoquinoline ring; X and Y, the same or different, represent an oxygen atom or a sulfur atom, with the proviso that the case X is a sulfur atom and Y is an oxygen atom be excluded; R1 represents a hydrogen atom, a halogen atom, an amino group, a cycloalkylamino group, an alkylcarbonylamino group, an alkyloxycarbonylamino group, an alkylaminocarbonyl group, or a non-aromatic heterocyclic group; and R2 and R2?, the same or different, represent a hydrogen atom, a halogen atom, an alkyl group, a halogeno-alkyl group, or a halogeno-alkoxy group.
    Type: Application
    Filed: January 29, 2008
    Publication date: January 21, 2010
    Inventors: Takahiro Honda, Koushi Fujisawa, Hiroyuki Aono, Masakazu Ban
  • Publication number: 20100003613
    Abstract: A toner produced by a method including dissolving or dispersing toner components comprising a resin, a colorant, and a release agent in a solvent to prepare a toner components liquid, discharging the toner components liquid from multiple nozzles provided on a thin film by vibrating the thin film by a mechanical vibration unit to form liquid droplets, and drying the liquid droplets into solid particles of the toner. The particle diameter distribution that is a ratio of a weight average particle diameter to a number average particle diameter of the toner is between 1.00 and 1.15, and a weight average particle diameter of the release agent in the toner is between 1% and 30% of an aperture diameter of the nozzle.
    Type: Application
    Filed: July 6, 2009
    Publication date: January 7, 2010
    Inventors: Takahiro Honda, Yohichiroh Watanabe, Yoshihiro Norikane, Shinji Ohtani
  • Publication number: 20090325100
    Abstract: The present invention provides a toner containing at least two binder resins composed of at least a resin A and a resin B which are incompatible with each other, and a colorant, wherein the toner has an average circularity of 0.93 to 0.98 and is produced by atomizing a toner composition liquid in a vapor phase to form liquid droplets and solidifying the liquid droplets, and the toner composition liquid is prepared by dissolving or dispersing the at least two binder resins and the colorant in an organic solvent.
    Type: Application
    Filed: June 12, 2008
    Publication date: December 31, 2009
    Inventors: Yohichiroh Watanabe, Kazumi Suzuki, Shinji Ohtani, Takahiro Honda, Yoshihiro Norikane
  • Patent number: 7638250
    Abstract: A toner is provided including a colorant; a binder resin (A) which is a polyester resin having no tetrahydrofuran insoluble component, and having a molecular weight distribution such that components having a molecular weight of not greater than 500 are included in an amount of not greater than 4% by weight and a peak is present in a molecular weight range of from 3,000 to 9,000 when measured by gel permeation chromatography (GPC); and a binder resin (B) which is a polyester resin having no tetrahydrofuran insoluble component, and including units of a polycarboxylic acid and a diol having the specific formula; wherein at least one of the binder resins (A) and (B) is prepared in the presence of the specific titanium-containing catalyst, and wherein a weight ratio ((A)/(B)) of the binder resin (A) to the binder resin (B) is from 60/40 to 85/15.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: December 29, 2009
    Assignee: Ricoh Company Limited
    Inventors: Takahiro Honda, Hiroyuki Fushimi, Osamu Uchinokura