Patents by Inventor Tomoichi Misawa
Tomoichi Misawa 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: 7530506Abstract: A valve element of a fuel injection valve comprises a cylindrical structural base which has an upper end contactable with a lower end of a core tube installed in a cylindrical case and a spherical valve head which is contactable with a valve seat arranged at a lower end of the cylindrical case. The structural base is a sintered magnetic metal member produced through a metal powder injection molding method and has a relative density ranging from approximately 95% to approximately 98%, and the structure base has, at the end thereof that is contactable with the downstream end of the core tube, a notched surface for suppressing an undesirable sticking of the end of the structural base to the downstream end of the core tube.Type: GrantFiled: May 21, 2003Date of Patent: May 12, 2009Assignee: Hitachi, Ltd.Inventors: Hideo Kato, Tomoichi Misawa, Nobuaki Kobayashi, Nobutaka Ishii
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Patent number: 7100848Abstract: A fuel injection valve of an internal combustion engine for a vehicle is comprised of a nozzle plate which has a plurality of nozzle holes. Fuel injection jets are injected from the nozzle holes and collided with each other. The thickness of the nozzle plate is equal to or greater than the diameter of the nozzle holes.Type: GrantFiled: May 9, 2003Date of Patent: September 5, 2006Assignee: Hitachi, Ltd.Inventors: Nobuaki Kobayashi, Nobutaka Ishii, Tomoichi Misawa, Hideo Kato
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Patent number: 6874710Abstract: A fuel injection valve includes: a magnetic barrel body made of a magnetic material and shaped substantially into a barrel, a core barrel made of a magnetic material and shaped substantially into a barrel, a valve seat member positioned on a downstream side of the core barrel and disposed in the magnetic barrel body, a valve body positioned between the core barrel and the valve seat member, an O-ring positioned in a vicinity of a flange portion of the magnetic barrel body, a fuel filter assembly disposed at the first end on the fuel's influx side of the magnetic barrel body. A flange of the fuel filter assembly is made of a material lower in hardness than the magnetic material of the magnetic barrel body. The flange of the fuel filter assembly has a diameter larger than the diameter of the flange portion of the magnetic barrel body.Type: GrantFiled: April 22, 2003Date of Patent: April 5, 2005Assignee: Hitachi Unisia Automotive, Ltd.Inventors: Nobutaka Ishii, Hideo Kato, Tomoichi Misawa, Nobuaki Kobayashi
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Publication number: 20030222159Abstract: A fuel injection valve of an internal combustion engine for a vehicle is comprised of a nozzle plate which has a plurality of nozzle holes. Fuel injection jets are injected from the nozzle holes and collided with each other. The thickness of the nozzle plate is equal to or greater than the diameter of the nozzle holes.Type: ApplicationFiled: May 9, 2003Publication date: December 4, 2003Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.Inventors: Nobuaki Kobayashi, Nobutaka Ishii, Tomoichi Misawa, Hideo Kato
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Publication number: 20030218081Abstract: A valve element of a fuel injection valve comprises a cylindrical structural base which has an upper end contactable with a lower end of a core tube installed in a cylindrical case and a spherical valve head which is contactable with a valve seat arranged at a lower end of the cylindrical case. The structural base is a sintered magnetic metal member produced through a metal powder injection molding method and has a relative density ranging from approximately 95% to approximately 98%, and the structure base has, at the end thereof that is contactable with the downstream end of the core tube, a notched surface for suppressing an undesirable sticking of the end of the structural base to the downstream end of the core tube.Type: ApplicationFiled: May 21, 2003Publication date: November 27, 2003Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.Inventors: Hideo Kato, Tomoichi Misawa, Nobuaki Kobayashi, Nobutaka Ishii
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Publication number: 20030209615Abstract: A fuel injection valve includes: a magnetic barrel body made of a magnetic material and shaped substantially into a barrel, a core barrel made of a magnetic material and shaped substantially into a barrel, a valve seat member positioned on a downstream side of the core barrel and disposed in the magnetic barrel body, a valve body positioned between the core barrel and the valve seat member, an O-ring positioned in a vicinity of a flange portion of the magnetic barrel body, a fuel filter assembly disposed at the first end on the fuel's influx side of the magnetic barrel body. A flange of the fuel filter assembly is made of a material lower in hardness than the magnetic material of the magnetic barrel body. The flange of the fuel filter assembly has a diameter larger than the diameter of the flange portion of the magnetic barrel body.Type: ApplicationFiled: April 22, 2003Publication date: November 13, 2003Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.Inventors: Nobutaka Ishii, Hideo Kato, Tomoichi Misawa, Nobuaki Kobayashi
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Patent number: 5361053Abstract: In a super magnetostriction type actuator constructed such that a super magnetostriction rod is extended/contracted by application of a magnetic field from a solenoid coil, and a drive object is moved in response to the extension/contraction, a locating member for locating the super magnetostriction rod thermally deforms in correspondence with a thermal expansion of the super magnetostriction rod so as to permit an extension of the super magnetostriction rod due to the thermal expansion thereof. As a result, variation in spring loading and lift with thermal expansion of the super magnetostriction rod can be avoided. Also, the magnetostriction characteristic of the locating member is opposite that of the super magnetostriction rod allowing for greater relative movement of the super magnetostriction rod upon application of a magnetic field.Type: GrantFiled: October 7, 1993Date of Patent: November 1, 1994Assignee: Unisia Jecs CorporationInventors: Yuichi Hosokawa, Kazumitsu Kobayashi, Tomoichi Misawa