Patents by Inventor Masashi Kawamata
Masashi Kawamata 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: 9116176Abstract: At least one conductor is disposed in sealed vessel, which is filled with insulating gas, an hand hole is provided to a part of sealed vessel and is closed by a sealed cover, and optical fibers are disposed that form a closed loop surrounding conductor in sealed vessel. Optical fibers are hermetically led out of sealed vessel from sealed cover and are provided with at least a light source unit and an optical signal processor unit at the lead-out end. An airtight hollow tube disposed looping around leaving a predefined distance of separation is provided to conductor in sealed vessel, the end of tube is hermetically connected to sealed cover by sealing/bonding means, and optical fibers can be inserted in sealing/bonding means.Type: GrantFiled: May 12, 2011Date of Patent: August 25, 2015Assignee: Hitachi, Ltd.Inventors: Wei Zhang, Masashi Kawamata, Hiroyuki Nakamichi, Tatsushi Yamaguchi, Daigorou Shiozawa
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Publication number: 20140360984Abstract: Compact lightweight gas insulated switchgear which assures sufficient electrode fixing strength equivalent to the fixing strength given by brazing and is structurally simple and enables efficient arc rotation with low operating energy. In the switchgear, a movable arcing contact is located on a movable element, opposite to a fixed arcing contact and electrically connected to, or disconnected from, the fixed arcing contact as the movable element moves. The movable arcing contact includes, in order from its tip opposite to the fixed arcing contact, a first electrode as a convex hollow coaxial cylindrical electrode, hollow coaxial cylindrical first spacer, and second electrode as a hollow coaxial cylindrical electrode and has electric conduction means to connect the first and second electrodes electrically through the first spacer. The first and second electrodes are fixed through the first spacer by a fixing member having higher resistivity than the first and second electrodes.Type: ApplicationFiled: June 4, 2014Publication date: December 11, 2014Applicant: HITACHI, LTD.Inventors: Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Masashi KAWAMATA
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Patent number: 8847084Abstract: Insulating spacer 1 has insulating molded member 3 molded as a single body with insulating material such as epoxy resin, in which at least one electric conductor 2, a grounding shield surrounding the electric conductor(s), and Optical fiber 14 of Faraday-effect element are embedded to form a build-in configuration. The grounding shield can be formed of cylindrical shielding member 15 made of metal wires, metal strips, or a cylindrical metallic member having a perforation of a plurality of small holes thereon. The aforementioned optical fiber 14, which is to be used as a component of an optical current transformer, is put in a certain place in cylindrical shielding member 15.Type: GrantFiled: March 8, 2011Date of Patent: September 30, 2014Assignee: Hitachi, Ltd.Inventors: Wei Zhang, Masashi Kawamata, Tatsushi Yamaguchi, Daigorou Shiozawa
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Publication number: 20130093409Abstract: At least one conductor is disposed in sealed vessel, which is filled with insulating gas, an hand hole is provided to a part of sealed vessel and is closed by a sealed cover, and optical fibers are disposed that form a closed loop surrounding conductor in sealed vessel. Optical fibers are hermetically led out of sealed vessel from sealed cover and are provided with at least a light source unit and an optical signal processor unit at the lead-out end. An airtight hollow tube disposed looping around leaving a predefined distance of separation is provided to conductor in sealed vessel, the end of tube is hermetically connected to sealed cover by sealing/bonding means, and optical fibers can be inserted in sealing/bonding means.Type: ApplicationFiled: May 12, 2011Publication date: April 18, 2013Applicant: HITACHI, LTD.Inventors: Wei Zhang, Masashi Kawamata, Hiroyuki Nakamichi, Tatsushi Yamaguchi, Daigorou Shiozawa
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Publication number: 20130025933Abstract: Insulating spacer 1 has insulating molded member 3 molded as a single body with insulating material such as epoxy resin, in which at least one electric conductor 2, a grounding shield surrounding the electric conductor(s), and Optical fiber 14 of Faraday-effect element are embedded to form a build-in configuration. The grounding shield can be formed of cylindrical shielding member 15 made of metal wires, metal strips, or a cylindrical metallic member having a perforation of a plurality of small holes thereon. The aforementioned optical fiber 14, which is to be used as a component of an optical current transformer, is put in a certain place in cylindrical shielding member 15.Type: ApplicationFiled: March 8, 2010Publication date: January 31, 2013Applicant: Hitachi, Ltd.Inventors: Wei Zhang, Masashi Kawamata, Tatsushi Yamaguchi, Daigorou Shiozawa
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Patent number: 7140334Abstract: A valve train for an internal combustion engine including a plurality of cylinders having different valve mechanism constructions, in which the valve train has a correcting member for correcting a difference in valve lift amount that is produced between the plurality of cylinders due to a difference in construction between valve mechanisms so as to make valve lift amounts of the plurality of cylinders substantially uniform.Type: GrantFiled: June 16, 2004Date of Patent: November 28, 2006Assignee: Honda Motor Co., Ltd.Inventors: Makoto Segawa, Yasuaki Asaki, Toshihiro Akiwa, Masashi Kawamata, Junya Iino
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Publication number: 20040255887Abstract: A valve train for an internal combustion engine including a plurality of cylinders having different valve mechanism constructions, characterized in that the valve train has correcting member for correcting a difference in valve lift amount that is produced between the plurality of cylinders due to a difference in construction between valve mechanisms so as to make valve lift amounts of the plurality of cylinders substantially uniform.Type: ApplicationFiled: June 16, 2004Publication date: December 23, 2004Applicant: HONDA MOTOR CO., LTDInventors: Makoto Segawa, Yasuaki Asaki, Toshihiro Akiwa, Masashi Kawamata, Junya Iino
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Patent number: 4744339Abstract: Disclosed is a centrifugal spark-advance control device for an ignition system of an internal combustion engine, comprising: a base plate which rotates at a speed corresponding to the rotational speed of the engine; a timing plate which is rotatably supported on the base plate; a spring for biasing the timing plate in a certain direction; a centrifugal weight which is pivoted to the base plate at a point spaced from the center of gravity of the centrifugal weight and which is provided with a cam surface for rotatably driving the timing plate in an opposite direction against the biasing force of the spring by cooperating with a corresponding cam follower surface provided in the timing plate; a spark generating device coupled to the timing plate for generating ignition sparks in synchronism with the rotational angle of the timing plate; a mass member attached to the timing plate by way of an elastic member.Type: GrantFiled: June 5, 1987Date of Patent: May 17, 1988Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Shigeru Nagai, Yasuhide Sakamoto, Hiromitsu Sato, Hideji Ohura, Masashi Kawamata, Masayuki Kumada