Patents by Inventor Satoshi Yasuda
Satoshi Yasuda 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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Patent number: 5989770Abstract: A process for producing a toner for developing an electrostatic latent image. The process has the steps of dispersing in an aqueous medium having a pH of from 4.5 to 8.5 a polymerizable monomer composition containing at least a polymerizable vinyl monomer, a colorant, an organic metal compound, an aromatic carboxylic acid, a polyester resin having an acid value of from 5 mg.multidot.KOH/g to 50 mg.multidot.KOH/g, and a polymerization initiator, to form particles of the polymerizable monomer composition in the aqueous medium, and polymerizing the polymerizable vinyl monomer in the particles of the polymerizable monomer composition.Type: GrantFiled: January 28, 1999Date of Patent: November 23, 1999Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Ugai, Satoshi Yasuda, Kazunori Kato
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Patent number: 5563369Abstract: A superconducting magnet is arranged in a helium tank, and the superconducting magnet cooled to a very low temperature by liquid helium in the helium tank is connected to a power source kept at room temperature by a current lead and a current lead. The current leads are constituted by conductors made of copper or a copper alloy having a residual resistivity of 5.times.10.sup.-8 .OMEGA..multidot.m or more. In a helium tank, a persistent current switch, cooled by liquid helium, for connecting the conductor to the conductor, is arranged. The persistent current switch magnetizes the superconducting magnet to a persistent current mode and demagnetizes it from the persistent current mode. The helium tank is arranged in a vacuum housing.Type: GrantFiled: January 10, 1994Date of Patent: October 8, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Takashi Yazawa, Satoshi Yasuda
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Patent number: 5310812Abstract: A toner for developing electrostatic latent images with a good combination of fixability, anti-offset characteristic, anti-sticking characteristic and pulverizability contains a composition comprising a colorant or magnetic material and a binder resin. The binder resin has 0.1 to 60 wt. % of a chloroform-insoluble or a THF (tetrahydrofuran)-insoluble component and a THF-soluble component, the THF-soluble providing a molecular weight distribution in the chromatogram of GPC (gel permeation chromatography) thereof such that there is a main peak in the molecular weight range of 1,000 to 25,000 and a sub-peak or shoulder in the molecular weight range of 2,000 to 150,000. The binder resin may suitably be obtained through two polymerization steps including a solution polymerization step and a suspension polymerization step.Type: GrantFiled: December 7, 1992Date of Patent: May 10, 1994Assignee: Canon Kabushiki KaishaInventors: Satoshi Yasuda, Kiichiro Sakashita, Yasuo Mitsuhashi, Seiichi Takagi, Shuichi Aita, Yoshinobu Nagai, Toshiaki Nakahara
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Patent number: 5300939Abstract: The present invention relates to an apparatus for measuring antenna radiation efficiency, wherein a random field measurement method can be adopted. In this apparatus, a to-be-measured antenna and a standard antenna are situated in a frame. In the frame, a plurality of rods, which are horizontally movable and extend vertically, are supported. A plurality of radio wave scatterers whose intervals and curvatures can be determined at random are held to the rods. In the frame, a random field is created by the radio wave scatterers.Type: GrantFiled: March 13, 1992Date of Patent: April 5, 1994Assignee: Kabushiki Kaisha ToshibaInventors: Tadahiko Maeda, Yoshiaki Tsukumo, Satoshi Yasuda, Syuuichi Sekine, Shuichi Obayashi
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Patent number: 5219947Abstract: A toner for developing electrostatic latent images with a good combination of fixability, anti-offset characteristic, anti-sticking characteristic and pulverizability is provided as a composition comprising a colorant or magnetic material and a binder resin. The binder resin has 0.1 to 60 wt. % of a chloroform-insoluble or a THF (tetrahydrofuran)insoluble and a THF-soluble, the THF-soluble providing a molecular weight distribution in the chromatogram of GPC (gel permeation chromatography) thereof such that there are a main peak in the molecular weight range of 1,000 to 25,000 and a sub-peak or shoulder in the molecular weight range of 2,000 to 150,000. The binder resin may suitably be obtained through two polymerization steps including a solution polymerization step and a suspension polymerization step.Type: GrantFiled: April 23, 1990Date of Patent: June 15, 1993Assignee: Canon Kabushiki KaishaInventors: Satoshi Yasuda, Kiichiro Sakashita, Yasuo Mitsuhashi, Seiichi Takagi, Shuichi Aita, Yoshinobu Nagai, Toshiaki Nakahara
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Patent number: 4987851Abstract: An organic film forming apparatus includes a trough storing water therein and a work drive device for moving a work with respect to the trough. The surface of the water is partitioned by a rod into a first developing region on which a monomolecular film is developed and a second developing region on which no monomolecular film is developed. The work is moved by the device through the developed monomolecular film so as to adhere the film on the surface of the work. The device has a holding mechanism which has a holding portion engaged with the work, and which holds the work so that when the work passes through the developed monomolecular film, the holding portion is away from the film or passes through the film after almost the entire work passes through the film.Type: GrantFiled: December 30, 1988Date of Patent: January 29, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Satoshi Yasuda, Shigeru Wakayama, Yoshiaki Tsukumo, Takashi Haraguchi, Syun Egusa
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Patent number: 4966829Abstract: A toner for developing electrostatic latent images with a good combination of fixability, anti-offset characteristic, anti-sticking characteristic and pulverizability is provided as a composition comprising a colorant or magnetic material and a binder resin. The binder resin has 0.1 to 60 wt. % of a chloroform-insoluble or a THF (tetrahydrofuran)-insoluble and a THF-soluble, the THF-soluble providing a molecular weight distribution in the chromatogram of GPC (gel permeation chromatography) thereof such that there are a main peak in the molecular weight range of 1,000 to 25,000 and a sub-peak or shoulder in the molecular weight range of 2,000 to 150,000. The binder resin may suitably be obtained through two polymerization steps including a solution polymerization step and a suspension polymerization step.Type: GrantFiled: November 23, 1988Date of Patent: October 30, 1990Assignee: Canon Kabushiki KaishaInventors: Satoshi Yasuda, Kiichiro Sakashita, Yasuo Mitsuhashi, Seiichi Takagi, Shuichi Aita, Yoshinobu Nagai, Toshiaki Nakahara
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Patent number: 4939060Abstract: A magnetic toner for developing electrostatic images, comprising at least a binder resin and a magnetic powder; the binder resin having 10 to 70 wt. % of a THF (tetrahydrofuran)-insoluble and a THF-soluble, the THF-soluble providing a molecular weight distribution in the chromatogram of GPC (gel permeation chromatography) thereof such that it provides a rate (Mw/Mn) of weight-average molecular weight (Mw)/number-average molecular weight (Mn).gtoreq.5, there are a peak in the molecular weight range of 2,000 to 10,000 and a peak or shoulder in the molecular weight range of 15,000 to 100,000 and a component having a molecular weight of 10,000 or smaller is contained in an amount of 10-50 wt. % based on the binder resin; the magnetic powder comprising spherical magnetic particles having a bulk density of 0.6 g/ml or larger.Type: GrantFiled: October 12, 1989Date of Patent: July 3, 1990Assignee: Canon Kabushiki KaishaInventors: Koichi Tomiyama, Seiichi Takagi, Ichiro Ohsaki, Satoshi Yasuda, Yoshihiko Hyosu
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Patent number: 4873185Abstract: A toner for dry electrophotography comprises a binder resin, a metal complex compound (A) of an aromatic hydroxycarboxylic acid having a lipophilic group, and a metal complex salt-type monoazo dye (B) having a hydrophilic group. The compound (A) functions to enhances the negative triboelectric chargeability of the toner, and the dye (B) functions to leak an excessive charge of the toner, so that the toner is caused to have a uniform and sharp triboelectric charge distribution. As a result, the toner involves little liability of causing "tailing", an irregularity caused by undesirable toner scattering.Type: GrantFiled: July 2, 1987Date of Patent: October 10, 1989Assignee: Canon Kabushiki KaishaInventors: Mitsuru Uchida, Satoshi Yasuda, Tetsuya Kuribayashi
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Patent number: 4824752Abstract: A magnetic dry developer, comprising negatively chargeable insulating magnetic toner particles containing, at least, a binder resin, a magnetic substance, and an organo-chromium or -zinc complex; cerium oxide particles containing CeO.sub.2 as a predominant component and having a volume average particle size of 1.0 to 4.0 microns, a heating loss of 0.5 wt. % or less on heating up to 100.degree. C. and a BET specific surface area of 15 m.sup.2 /g or less as measured by the nitrogen adsorption method; and hydrophobicity-imparted negatively chargeable silicon oxide particulates. The cerium oxide particles have a function of disintegrating particularly the hydrophobicity-imparted silicon oxide particulates and enhance the attachment thereof to the toner particles, whereby the developing characteristics including the magnetic triboelectric chargeability are stabilized from the initial stage of electrophotographic copying operation.Type: GrantFiled: September 12, 1988Date of Patent: April 25, 1989Assignee: Canon Kabushiki KaishaInventors: Satoshi Yasuda, Mitsuru Uchida, Seiichi Takagi, Yusuke Karami
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Patent number: 4689970Abstract: A cryogenic apparatus comprises a refrigerant vessel containing a superconducting magnet and a refrigerant, a vacuum casing containing the vessel, a radiation shield disposed between the vessel and the casing such as to enclose the vessel, a refrigerator for cooling at least one of the shield and the vessel, and a thermal conductive coupling disposed between the refrigerator and at the least one of the shield and the vessel, and turning on and off the heat transfer therebetween.Type: GrantFiled: June 26, 1986Date of Patent: September 1, 1987Assignee: Kabushiki Kaisha ToshibaInventors: Hirotsugu Ohguma, Mitsuo Harada, Hideaki Saura, Satoshi Yasuda
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Patent number: 4599866Abstract: A magnetic refrigerator includes a plurality of working substances each of which, when it is within a magnetic field, generates heat and, when it is outside the magnetic field, absorbs the heat to permit a gas to be condensed on the outer surface of the working substance. The working substance has even surfaces and an uneven surface formed on said outer surface thereof. A heat elimination system which, only when the working substance is within the magnetic field, contacts the even surfaces of the working substance to take the heat from the working substance, is provided.Type: GrantFiled: May 30, 1985Date of Patent: July 15, 1986Assignee: Kabushiki Kaisha ToshibaInventors: Hideki Nakagome, Satoshi Yasuda
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Patent number: 4589953Abstract: A working material used in a magnetic refrigerator radiates heat when it is magnetized and absorbs heat when it is demagnetized. The working material is cylindrical and extends vertically. A heat pipe has a cylindrical internal space directly surrounding the peripheral surface of the working material and containing helium gas as a heat medium. The peripheral surface of the working material in contact with the internal space functions as a condensing surface of the heat pipe. A superconductive coil surrounds the working material and intermittently applies a magnetic field thereto. A refrigerator unit supplies a cooling space with helium gas at 20.degree. K. or below. The helium gas from the refrigerator unit removes heat produced from the working material when it is adiabatically magnetized by the coil. When the working material is adiabatically demagnetized, it rapidly absorbs heat to cool the helium gas in the internal space of the heat pipe.Type: GrantFiled: January 25, 1985Date of Patent: May 20, 1986Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Hideki Nakagome, Satoshi Yasuda
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Patent number: 4554790Abstract: A magnetic refrigerating apparatus comprises two pairs of superconductive coils for generating magnetic fields, a tank for receiving helium to be cooled, and a pair of heat absorbers each including a working substance adapted to generate heat when located inside the magnetic field generated by the coils and to absorb heat when located outside the magnetic field. The heat absorbers are alternately transferred between a first position where either of the heat absorbers is located inside the magnetic field and a second position where the heat absorber is located outside the magnetic field so that one of the heat absorbers is in the first position when the other is in the second position, whereby helium is cooled by either of the heat absorbers when the heat absorber is in the second position.Type: GrantFiled: February 13, 1985Date of Patent: November 26, 1985Assignee: Kabushiki Kaisha ToshibaInventors: Hideki Nakagome, Satoshi Yasuda
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Patent number: 4509334Abstract: A working material used in a magnetic refrigerator radiates heat when it is magnetized and absorbs heat when it is demagnetized. The working material is cylindrical and extends vertically. A heat pipe has a cylindrical internal space directly surrounding the peripheral surface of the working material and containing helium gas as a heat medium. The peripheral surface of the working material in contact with the internal space functions as a condensing surface of the heat pipe. A superconductive coil surrounds the working material and intermittently applies a magnetic field thereto. A refrigerator unit supplies a cooling space with helium gas at 20.degree. K. or below. The helium gas from the refrigerator unit removes heat produced from the working material when it is adiabatically magnetized by the coil. When the working material is adiabatically demagnetized, it rapidly absorbs heat to cool the helium gas in the internal space of the heat pipe.Type: GrantFiled: May 23, 1983Date of Patent: April 9, 1985Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Hideki Nakagome, Satoshi Yasuda