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).
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Publication number: 20130196260Abstract: A toner including: a binder resin containing a non-crystalline resin and a crystalline resin; a colorant; and, a releasing agent, wherein the releasing agent has a melting point of 55° C. to 80° C., and wherein the toner satisfies the following Expressions 1 and 2: (Expression 1): 20,000 Pa·s?G1?50,000 Pa·s; and (Expression 2): (G4/G2)/(G3/G1) 1.00, where G1 is a storage modulus, G2 is a loss modulus, G3 is a storage modulus and G4 is a loss modulus, and the storage modulus G1 and the loss modulus G2 are measured at 80° C. when the toner is heated from 70° C. to 150° C. and the storage modulus G3 and the loss modulus G4 are measured at 80° C. when the toner heated to 150° C. is cooled to 70° C.Type: ApplicationFiled: December 28, 2012Publication date: August 1, 2013Inventors: Ryuuta YOSHIDA, Takahiro HONDA, Junichi AWAMURA, Osamu UCHINOKURA, Masaki WATANABE, Daisuke INOUE, Tomoki MURAYAMA, Mamoru HOZUMI
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Publication number: 20130196266Abstract: 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: ApplicationFiled: March 13, 2013Publication date: August 1, 2013Inventors: Yohichiroh Watanabe, Kazumi Suzuki, Takahiro Honda, Shinji Ohtani, Yoshihiro Norikane
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Publication number: 20130196261Abstract: To provide a toner, which contains: toner base particles each containing a binder resin and a colorant; and an external additive containing inorganic particles and fatty acid metal salt particles, wherein the inorganic particles contain at least hydrophobic silica particles, wherein a liberation ratio Ya of the hydrophobic silica particles from the toner is 1% by mass to 20% by mass, and wherein a libration ratio Yb of the fatty acid metal salt particles from the toner is 30% by mass to 90% by mass.Type: ApplicationFiled: January 17, 2013Publication date: August 1, 2013Inventors: Osamu UCHINOKURA, Tomoyuki Satoh, Takahiro Honda, Daisuke Inoue, Mamoru Hozumi
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Publication number: 20130130171Abstract: A toner including a core particle, an inner shell layer covering the core, and an outer shell layer covering the inner shell layer is provided. The core particle includes a resin P. The inner shell layer includes fine particles of a resin A. The outer shell layer includes fine particles of a resin B. The toner satisfies the following formulae (1) to (3): 4.5?T½(P)?Tfb(P)?14??(1) 20?T½(A)?Tfb(A)?40??(2) 23.5?T½(B)?Tfb(B)?40??(3) wherein T½(P), T½(A), and T½(B) represent ½ method temperatures of the resins P, A, and B, respectively, and Tfb(P), Tfb(A), and Tfb(B) represent flow beginning temperatures of the resins P, A, and B, respectively, and wherein the ½ method temperatures and the flow beginning temperatures are measured by a flowtester.Type: ApplicationFiled: November 1, 2012Publication date: May 23, 2013Inventors: Masaki Watanabe, Osamu Uchinokura, Junichi Awamura, Takahiro Honda, Satoshi Ogawa, Tsuneyasu Nagatomo, Hiroshi Yamashita
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Patent number: 8435716Abstract: 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: GrantFiled: February 4, 2011Date of Patent: May 7, 2013Assignee: Ricoh Company, Ltd.Inventors: Masaki Watanabe, Osamu Uchinokura, Tsuneyasu Nagatomo, Takahiro Honda, Ryuta Chiba
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Publication number: 20130022371Abstract: To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A>0.165, and has storage elastic modulus (dyne/cm2) G?(Tfb) satisfying G?(Tfb)?1×104 where Tfb is a flow onset temperature (° C.) of the low molecular weight resin component as measured by a capillary rheometer: A=|[ln G?(r1)?ln G?(r2)]/(T1?T2)|??Formula (1) (where T1 is temperature (° C.) at which storage elastic modulus G?(r1) is 1×105 (dyne/cm2) and T2 is temperature (° C.) at which storage elastic modulus G?(r2) is 1×103 (dyne/cm2) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and ? represents an absolute value.Type: ApplicationFiled: October 12, 2011Publication date: January 24, 2013Applicant: Ricoh Company, Ltd.Inventors: Teruki Kusahara, Junichi Awamura, Tsuyoshi Sugimoto, Hyo Shu, Tomomi Suzuki, Osamu Uchinokura, Takahiro Honda, Satoshi Kojima, Satoshi Ogawa, Daisuke Inoue, Koshi Sato, Daisuke Ito, Ryuuta Yoshida, Syouko Satoh
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Patent number: 8329373Abstract: 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: GrantFiled: October 23, 2009Date of Patent: December 11, 2012Assignee: Ricoh Company, Ltd.Inventors: Yoshihiro Norikane, Shinji Aoki, Masaru Ohgaki, Yohichiroh Watanabe, Takahiro Honda, Andrew Mwaniki Mulwa, Yuko Sekiguchi
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Patent number: 8318400Abstract: A method of preparing a toner, including periodically discharging a toner constituent liquid from plural nozzles having the same aperture diameter with a mechanical oscillator, wherein the toner constituent liquid includes: a binder resin, a colorant, and an organic solvent, wherein the binder resin and the colorant are dissolved or dispersed in the organic solvent; forming a droplet of the toner constituent liquid in a gas phase; and solidifying the droplet, wherein the aperture diameter is from 3 to 30 ?m, and the binder resin has a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn) of THF (tetrahydrofuran)-soluble components therein of from 1.5 to 15 in a molecular weight distribution measured by GPC (gel permeation chromatography), and a ½ flow temperature (Tm) of from 114 to 149° C.Type: GrantFiled: November 4, 2008Date of Patent: November 27, 2012Assignee: Ricoh Company, Ltd.Inventors: Yohichiroh Watanabe, Kazumi Suzuki, Takahiro Honda, Shinji Ohtani, Yoshihiro Norikane
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Patent number: 8268526Abstract: 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: GrantFiled: April 7, 2010Date of Patent: September 18, 2012Assignee: Ricoh Company, Ltd.Inventors: Hiroto Higuchi, Fumihiro Sasaki, Shinichiro Yagi, Shigeru Emoto, Junichi Awamura, Naohito Shimota, Masami Tomita, Toshiki Nanya, Takahiro Honda, Maiko Kondo
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Patent number: 8263304Abstract: 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: GrantFiled: August 31, 2009Date of Patent: September 11, 2012Assignee: Ricoh Company, Ltd.Inventors: Takahiro Honda, Yohichiroh Watanabe, Kazumi Suzuki
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Patent number: 8252500Abstract: 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: GrantFiled: June 12, 2008Date of Patent: August 28, 2012Assignee: Ricoh Company, Ltd.Inventors: Yohichiroh Watanabe, Kazumi Suzuki, Shinji Ohtani, Takahiro Honda, Yoshihiro Norikane
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Publication number: 20120202817Abstract: A compound having the following formula [I] or a pharmaceutically acceptable salt thereof: wherein A is an aromatic five-membered heterocycle which optionally is fused with a cycloalkane ring; B is an alkylene; R1 and R2 are hydrogen, hydroxyl, alkoxy, aryloxy, alkyl, cycloalkyl, aryl, heterocycle, amino, alkylamino, arylamino or acyl, or R1 and R2 join together to form a heterocycle; X and Y are hydrogen, halogen, hydroxyl, alkoxy, aryloxy, alkyl, cycloalkyl, aryl, mercapto, alkylthio, arylthio, carboxyl, an ester of carboxyl, an amide of carboxyl, cyano or nitro; p is 0, 1 or 2; and q is 0 or 1. The compound is useful for treating diseases in which angiogenesis or augmentation of vascular permeability is involved.Type: ApplicationFiled: April 18, 2012Publication date: August 9, 2012Applicant: SANTEN PHARMACEUTICAL CO., LTD.Inventors: Takahiro Honda, Hisashi Tajima, Yoshimasa Sasabuchi, Kenji Kawashima, Kazuyoshi Okamoto, Minoru Yamamoto, Masakazu Ban
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Patent number: 8207194Abstract: A compound having the following formula [I] or a pharmaceutically acceptable salt thereof: wherein A is benzene or an aromatic five-membered heterocycle which optionally is fused with a cycloalkane ring; B is an alkylene; R1 and R2 are hydrogen, hydroxy, alkoxy, aryloxy, alkyl, cycloalkyl, aryl, heterocycle, amino, alkylamino, arylamino or acyl, or R1 and R2 join together to form a heterocycle; X and Y are hydrogen, halogen, hydroxy, alkoxy, aryloxy, alkyl, cycloalkyl, aryl, mercapto, alkylthio, arylthio, carboxyl, an ester of carboxyl, an amide of carboxyl, cyano or nitro; p is 0, 1 or 2; and q is 0 or 1. The compound is useful for treating diseases in which angiogenesis or augmentation of vascular permeability is involved.Type: GrantFiled: March 10, 2009Date of Patent: June 26, 2012Assignee: Santen Pharmaceutical Co., Ltd.Inventors: Takahiro Honda, Hisashi Tajima, Yoshimasa Sasabuchi, Kenji Kawashima, Kazuyoshi Okamoto, Minoru Yamamoto, Masakazu Ban
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Publication number: 20120051771Abstract: The image forming apparatus includes a patch image forming unit that forms a patch image on an intermediate transfer member; a background toner density acquisition unit that acquires a background toner density of the intermediate transfer member in the period from a startup time for calibration to elapse of a single-rotation period, and that acquires a background toner density acquisition elapse time; a patch toner density acquisition unit that acquires the toner density of the patch image, and that acquires the patch toner density acquisition elapse time from the elapse time of a single-rotation period to the acquisition of the patch toner density; and a background toner density determination unit that determines the background toner density at the time corresponding to an elapse time that approximates the patch toner density acquisition elapse time as the background toner density at the position at which the patch toner density is acquired.Type: ApplicationFiled: August 30, 2011Publication date: March 1, 2012Applicant: KYOCERA MITA CORPORATIONInventor: Takahiro Honda
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Patent number: 8110332Abstract: Provided are an electrophotographic toner and a method for producing the electrophotographic toner that satisfy high image quality, cleaning stability, and high productivity. The electrophotographic toner is produced by spray-drying a toner ingredient-containing liquid, wherein the toner ingredient-containing liquid dissolves or disperses at least a resin, a low molecular mass organic material, and a colorant in an organic solvent, the resin is soluble in the organic solvent, the low molecular mass organic material is a crystalline compound or a composition of crystalline compounds that is soluble in the organic solvent, the toner ingredient-containing liquid contains substantially no particles having a particle diameter of 500 nm or more, the crystalline compound or the composition of crystalline compounds crystallizes upon spray-drying to deform toner particles into a circularity of 0.93 or higher to 0.98 or less, and volume average particle diameter of the toner particles is 3.Type: GrantFiled: February 25, 2008Date of Patent: February 7, 2012Assignee: Ricoh Company, Ltd.Inventors: Kazumi Suzuki, Yohichiroh Watanabe, Takahiro Honda, Yoshihiro Norikane, Shinji Ohtani, Tsuyoshi Sugimoto
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Patent number: 8107832Abstract: An image forming apparatus includes a belt, an image forming section, a displacement operation section and a displacement control section. The image forming section includes a color image forming unit and a monochrome image forming unit. The displacement operation section conducts a press-contact operation and a release operation. The press-contact operation brings into contact the image carrier and the belt. The release operation separates the image carrier from the belt. The displacement control section controls the displacement operation section to perform the press-contact operation when the cumulative number of color images is greater than the cumulative number of monochrome images after the image forming section forms a series of images. The displacement control section controls the displacement operation section to perform the release operation when the cumulative number of color images is less than the cumulative number of monochrome images after the image forming section forms a series of images.Type: GrantFiled: June 15, 2009Date of Patent: January 31, 2012Assignee: Kyocera Mita CorporationInventor: Takahiro Honda
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Publication number: 20120021347Abstract: To provide a toner A containing: base particles, each containing polyester, microcrystalline wax, and a colorant; and spherical silica particles having an average primary particle diameter of 100 nm to 150 nm, wherein the microcrystalline wax has an onset temperature of 45° C. to 60° C. as determined by DSC, and a carbon number distribution of 25 to 55.Type: ApplicationFiled: July 22, 2011Publication date: January 26, 2012Inventors: Naohito Shimota, Takahiro Honda, Tsuneyasu Nagatomo, Ryuta Chiba
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Publication number: 20110294058Abstract: A toner containing a wax, wherein the wax has a mass decrease at 165° C. of 10% by mass or less, a molecular chain consisting of C—H bonds and C—C bonds, and a penetration of 5 mm to 25 mm, wherein a product of a ½ method softening point (° C.) of the toner and an amount of the wax on a surface of the toner is 8 to 20, and wherein the toner is obtained by a method including emulsifying or dispersing in an aqueous medium a toner material liquid, which is a liquid containing a toner material, which contains the wax.Type: ApplicationFiled: May 24, 2011Publication date: December 1, 2011Inventors: Masana SHIBA, Takahiro Honda, Tsuneyasu Nagatomo, Naohito Shimota, Ryuta Chiba
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Patent number: 8063034Abstract: 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: GrantFiled: January 29, 2008Date of Patent: November 22, 2011Assignee: Santen Pharmaceutical Co., Ltd.Inventors: Takahiro Honda, Koushi Fujisawa, Hiroyuki Aono, Masakazu Ban
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Publication number: 20110268462Abstract: An image forming apparatus has a memory, an image forming unit, an intermediate transfer member, a density detector, a background density measurer, a test patch controlling unit and a density correcting unit. The density detector detects the density of the intermediate transfer member. The background density measurer stores background density, in the memory in correspondence with position information on the intermediate transfer member at a predetermined timing before a calibration for adjusting image formation density. The test patch controlling unit causes the image forming unit to form a test patch, on the intermediate transfer member while the intermediate transfer member is driven at a predetermined speed. The density correcting unit executes the calibration to adjust image formation density according to a difference between the background density stored in the memory when executing the calibration and corresponding to the position and density of the test patch.Type: ApplicationFiled: April 21, 2011Publication date: November 3, 2011Applicant: KYOCERA MITA CORPORATIONInventor: Takahiro Honda