Patents by Inventor Ryoichi Ito
Ryoichi Ito 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: 6258502Abstract: A two-component developer includes a magnetic carrier including magnetic carrier particles with an average particle diameter of 35 &mgr;m to 100 &mgr;m, and a toner including toner particles with a weight-average particle diameter of 6.0 &mgr;m to 11.5 &mgr;m, to which at least one additive is externally added thereto in an amount of 0.3 to 1.5 wt. % to the toner, the toner particles including (a) toner particles with a particle diameter of 5 &mgr;m or less with a content ratio of 15% or less by number, and (b) toner particles with such a particle diameter that is two times or greater than the weight-average particle diameter of the toner particles with a content ratio of 5% or less by volume, the toner particles satisfying a relationship of 0.60≦D25/D75≦0.85 as defined in the specification. A container in which the two-component developer is contained, and an electrophotographic image formation apparatus in which the container is incorporated are proposed.Type: GrantFiled: May 30, 2000Date of Patent: July 10, 2001Assignee: Ricoh Company, Ltd.Inventors: Yasushi Nakamura, Noboru Kuroda, Ryoichi Ito, Yasuaki Iwamoto, Kohki Katoh, Yoshihiro Sugiyama, Kenichi Uehara, Tomio Kondou
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Publication number: 20010006197Abstract: A two-step process for the production of a toner for developing electrostatic images, including a first pulverizing step wherein a toner composition containing a binder and a coloring agent is pulverized to obtain preliminarily pulverized particles having a weight average particle diameter of 20-100 &mgr;m and containing no more than 50% by weight of particles having roundness of 0.90 or less, and a second pulverizing step wherein the preliminarily pulverized particles are finely pulverized to obtain finely pulverized particles having a weight average particle diameter of 5-13 &mgr;m and containing no more than 30% by weight of particles having roundness of 0.90 or less and no more than 15%, based on the total number of particles of the finely pulverized particles, of particles having a particle diameter of 5 &mgr;m or less.Type: ApplicationFiled: December 21, 2000Publication date: July 5, 2001Applicant: RICOH COMPANY, LTD.Inventors: Nobuyasu Makino, Tomotsugu Miyamoto, Mitsuyoshi Izu, Ryoichi Ito, Yasuaki Iwamoto, Kazuyuki Yazaki
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Patent number: 6183926Abstract: A toner is made or toner particles which contains a binder resin and a coloring agent, wherein the toner particles have a weight-average particle size in a range of 6.0 to 11.5 &mgr;m, and contains toner particles (a) with a particle diameter of 5 &mgr;m or less in a content ratio of 1 to 15% by number, and toner particles (b) with a particle diameter of twice or more the weight-average particle size in a content ratio of 5 wt % or less, and the number-average particle size D25 and the number-average particle size D75 respectively obtained when the cumulative number of the toner particles reaches 25% and 75% at the measurement of a cumulative toner particle distribution by number thereof are in the relationship of 0.60≦D25/D75≦0.95. A two-component developer includes the above-mentioned toner and a carrier.Type: GrantFiled: October 25, 1999Date of Patent: February 6, 2001Assignee: Ricoh Company, Ltd.Inventors: Noboru Kuroda, Yasushi Nakamura, Ryoichi Ito, Yasuaki Iwamoto, Kohki Katoh, Tomio Kondou, Kenichi Uehara, Yoshihiro Sugiyama, Yasuyuki Sanui
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Patent number: 5797778Abstract: The present invention is a mounting arrangement for an engine powering a water propulsion device of a watercraft having a hull. The engine is connected to the hull with three engine mounts. A first pair of mounts are positioned on opposite sides of the engine, and the third mount connects one end of the engine to the hull. The side mounts are positioned equidistantly from a line passing through a center of gravity of the engine and parallel to a line extending along the crankshaft of the engine. The third mount is positioned along the line passing through the center of gravity. Each mount comprises a pad engaging a bracket extending from the engine. Each pad is positioned on a threaded shaft which engages a threaded mounting of connected to the hull, whereby the height of each pad, and thus the engine, may be changed with respect to the hull without changing the position of the engine relative to the pads.Type: GrantFiled: January 30, 1997Date of Patent: August 25, 1998Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Ryoichi Ito, Masamichi Fujiwara
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Patent number: 5582795Abstract: A hold-transfer system for extraction containers has a main body and a cassette detachable from the main body. The cassette has holding devices for holding extraction containers in an upright position, an endless traveling member carrying the holding devices arranged in a row, and a driving rotor and a driven rotor engaging the endless traveling member about perimeters thereof. The endless traveling member has rotatable support member for rotatably supporting the holding devices with lower portions of the holding devices protruding below the rotatable support members and accessible from beneath the cassette. The main body has a driving motor for driving the driving rotor and an identifying device, installed at a reading position relative to a specified position for an extraction, for identifying an identification mark associated with one of the extraction containers.Type: GrantFiled: April 5, 1995Date of Patent: December 10, 1996Assignees: Furuno Electric Company, Limited, Mitsui Pharmaceuticals, Inc.Inventors: Takashi Nishina, Ryoichi Ito
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Patent number: 5072629Abstract: A shift assisting mechanism for assisting the shifting of a dog clutch of a marine transmission by reducing the engine speed. The requirement for engine speed reduction is sensed by a pressure sensitive conductive rubber type pressure sensing switch contained within the interconnection between the operator and the dog clutch.Type: GrantFiled: September 5, 1990Date of Patent: December 17, 1991Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Itsushi Hirukawa, Ryoichi Ito
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Patent number: 5007383Abstract: In a water-cooling system for a water-cooled horizontal engine, a radiator and a radiator fan are arranged at the front of a cylinder head which is mounted forwardly of a cylinder block of the engine. A radiator fan generates a cooling air flow which passes through the space over the cylinder head and toward the radiator, the height of the radiator being sized to match the width of the cylinder block measured in the upward and downward direction.Type: GrantFiled: August 21, 1989Date of Patent: April 16, 1991Assignee: Kubota LimitedInventors: Ryoichi Ito, Koji Iwai, Tsuyoshi Nishida
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Patent number: 4907546Abstract: In an air-cooled type cooling system for an engine working machine assembly in which a working machine such as a generator, a compressor and the like is adapted to be driven by an internal combustion engine, there are provided an air-cooled engine, a working machine and an exhaust muffler in a machine area as well as a centrifugal cooling fan in a fan room within a casing. An exhaust air outlet passage and an exhaust air conduction passage are provided in such a manner as to come out in parallel from the periphery of the fan area. Part of the cooling air sucked into the fan area after cooling the engine and the working machine in the machine area is adapted to be discharged directly outside the casing through the exhaust air outlet passage, and the remaining part thereof is adapted to be discharged outside the casing through the exhaust air conduction passage after cooling the exhaust muffler.Type: GrantFiled: November 21, 1988Date of Patent: March 13, 1990Assignee: Kubota Ltd.Inventors: Akira Ishii, Koji Iwai, Ryoichi Ito, Osamu Murakami
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Patent number: 4883024Abstract: In a water-cooling system for a water-cooled horizontal cylinder engine, a radiator and a radiator fan are arranged at the front of a cylinder head which is mounted forwardly of a cylinder block of the engine. A radiator fan generates a cooling air flow which passes through the space over the cylinder head and toward the radiator, the height of the radiator being sized to match the width of the cylinder block measured in the upward and downward direction.Type: GrantFiled: December 30, 1987Date of Patent: November 28, 1989Assignee: Kubota LimitedInventors: Ryoichi Ito, Koji Iwai, Tsuyoshi Nishida, Junji Kimura
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Patent number: 4856470Abstract: In an engine working machine assembly with a soundproof cover, the soundproof cover is provided for the engine working machine assembly in which a working machine such as a generator, a compressor and the like is adapted to be driven by an internal combustion engine, the working machine and a cooling fan are arranged in order upward above the vertical shaft type air-cooled engine as the internal combustion engine, and a fan case is fixedly secured at its lower wall portion to the engine through a cooling air guide cover for the working machine and a cooling air guide cover for the engine. The soundproof cover comprises an upper side cover section, a front side cover section and a back side cover section.Type: GrantFiled: November 23, 1988Date of Patent: August 15, 1989Assignee: Kubota Ltd.Inventors: Akira Ishii, Ryoichi Ito
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Patent number: 4779905Abstract: In an engine generator having a work generator arranged at the upper side of an engine of a vertical crank shaft type, the output shaft of the engine projects upwards from the engine crank case so as to be connected to the rotor of the work generator. And the stator is arranged so as to encircle the rotor and to be encircled by an air induction casing. A cooling fan of a centrifugal blower type is located at the upper end of the rotor shaft with the blades thereof directed to the side of the generator so as to supply a cooling air flowing upwards to both the interior and the exterior of the stator during operation.Type: GrantFiled: August 25, 1987Date of Patent: October 25, 1988Assignee: Kubato Ltd.Inventors: Ryoichi Ito, Kenji Ueno, Tutomu Wada, Osamu Murakami, Shigeru Kawabata, Kazuo Higo, Akiyoshi Morikawa
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Patent number: 4680318Abstract: A foaming resin composition comprising an unsaturated random copolymer consisting of propylene, ethylene, and a branched 1,4-diene represented by the following formula: ##STR1## wherein R.sup.1 represents an alkyl group having not more than 8 carbon atoms; and R.sup.2 and R.sup.3 each represents a hydrogen atom or an alkyl group having not more than 8 carbon atoms, provided that R.sup.2 and R.sup.3 do not simultaneously represent a hydrogen atom, and a chemical foaming agent. The composition is prevented from increasing in temperature due to shearing during molding into a foamable sheet and, therefore, provides a uniform foamed product.Type: GrantFiled: November 7, 1986Date of Patent: July 14, 1987Assignee: Mitsubishi Petrochemical Co., Ltd.Inventors: Masaki Fujii, Shiroh Gotoh, Hideaki Nakagawa, Ryoichi Ito
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Patent number: 4557432Abstract: The stroke apparatus contemplated herein comprises a plurality of annular races each having an inner annular surface of an arcuately bulging cross-section and rotatably accommodated in a support. These annular races are rotatably journaled in a housing in an alternately offset or staggering fashion. A rotary shaft extends through these annular races, and one of the race supports has a pivotal shaft placed at the center of, or at a shifted position from, the corresponding other races and the upper and lower race supports have their pivotal shafts placed in positions shifted to the opposite sides of the rotary shaft. The bulging cross-sections of each of the annular races is forced in contact with the rotary shaft. A guide stem is provided in parallel with the rotary shaft and engaging said housing for sliding movement therealong.Type: GrantFiled: April 29, 1985Date of Patent: December 10, 1985Inventor: Ryoichi Ito
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Patent number: 4487180Abstract: An engine has a load detector, or more specifically a threshold load comparator, and also detectors for sensing any abnormality of various factors influencing the normal engine operation. When no abnormality is sensed, the engine is made to operate automatically at a low speed level when the engine load is below the threshold value, and at a high speed level when the load is beyond such value. When any abnormality is sensed, then the engine is emergently halted in a fail-safe manner, thus any damaging disorder in controling circuitry for effecting such emergent halting leads in itself to emergent halting of the engine as well.Type: GrantFiled: November 21, 1983Date of Patent: December 11, 1984Assignee: Kubota, Ltd.Inventors: Ryoichi Ito, Osamu Murakami, Masayuki Nakamura, Kazuo Higo, Kengi Ueno
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Patent number: 4370517Abstract: A polyolefin insulated electric cable exhibiting the effect of suppressed water tree formation which comprises an electrical insulation layer comprising a polyolefin containing about 0.01 to 13.0% by weight ester groups provided around a conductor.Type: GrantFiled: December 18, 1980Date of Patent: January 25, 1983Assignee: Hitachi Cable LimitedInventors: Kenichiro Soma, Shoji Kuma, Harunori Sakaguchi, Hisanari Shirai, Ryoichi Ito, Toshio Shiina
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Patent number: 4329658Abstract: A semiconductor laser device is formed of a semiconductor material assembly including a first semiconductor layer having an active region formed directly by crystal growth on a substrate for the crystal growth having on the surface thereof a second semiconductor layer. A third semiconductor layer is also formed on the first layer. The refractive index of each of the second semiconductor material region and the third semiconductor layer is smaller than that of the first semiconductor layer while the band gap of each of the second semiconductor material region and the third semiconductor layer is broader than that of the first semiconductor layer.Type: GrantFiled: June 22, 1979Date of Patent: May 11, 1982Assignee: Hitachi, Ltd.Inventors: Atsutoshi Doi, Kunio Aiki, Naoki Chinone, Satoshi Nakamura, Ryoichi Ito
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Patent number: 4315226Abstract: A semiconductor laser device is capable of producing an increased optical output power with improved optical characteristics without being subjected to mode distortions in the output beam, while retaining advantageous features inherent to a semiconductor laser device of a buried heterostructure. The semiconductor laser device comprises an optical confinement region which is constituted by at least first, second, third and fourth semiconductor layers successively laminated on a predetemined semiconductor substrate. The second semiconductor layer has a relatively small refractive index and a relatively wide band gap as compared with those of the third semiconductor layer, while the first and the fourth semiconductor layers which are of the conductivity types opposite to each other have relatively small refractive indexes as compared with the second and the third semiconductor layers.Type: GrantFiled: September 20, 1979Date of Patent: February 9, 1982Assignee: Hitachi, Ltd.Inventors: Naoki Chinone, Kazutoshi Saito, Noriyuki Shige, Ryoichi Ito
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Patent number: 4298974Abstract: An optical head comprising a semiconductor laser array which is used as a light source, and an optical system which guides laser beams from the array to a predetermined recording medium. The beam from one lasing point of the array is modulated by predetermined information and is used as a recording beam, while the beam from another lasing point is continuously oscillated and is used as a playback beam.Type: GrantFiled: May 10, 1979Date of Patent: November 3, 1981Assignee: Hitachi, Ltd.Inventors: Yoshito Tsunoda, Kimio Tatsuno, Toshimitsu Miyauchi, Kunio Aiki, Ryoichi Ito
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Patent number: 4270134Abstract: A light-emitting semiconductor device is provided having a light-emitting semiconductor element emitting light in two directions. The light-emitting element is disposed in a housing so that one light-emitting face of the semiconductor element adjacent a heat sink, and a light guide is arranged to confront the other light-emitting face of the semiconductor element and to guide light from said other light-emitting face to the outside of the housing. In this device, the end face of the light guide confronting said other light-emitting face of the semiconductor element includes a face substantially inclined to the optical axis of light emitted from the semiconductor element.Type: GrantFiled: April 30, 1979Date of Patent: May 26, 1981Assignee: Hitachi, Ltd.Inventors: Yutaka Takeda, Kunio Aiki, Ryoichi Ito
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Patent number: 4206166Abstract: A polyolefin foam article having a smooth, lustrous skin is produced by packing small pieces of polyolefin foam in the cavity formed between a male mold and a female mold of a mold assembly. One of the molds has no perforations for the passage of vapor and the other of the molds has: (1) perforations for the passage of a vapor; and (ii) at least two chambers which divide the perforations for the passage of vapor into perforations which permit the entrance of steam into the cavity and perforations which permit the exit of steam carrying entrained air present in and between the small pieces of polyolefin foam from the cavity.Type: GrantFiled: November 13, 1975Date of Patent: June 3, 1980Assignees: Mitsubishi Petrochemical Co., Ltd., Daisen Industry and Co., Ltd.Inventors: Tatsuo Hayashi, Ryoichi Ito