Patents by Inventor Kazuki Ishikawa
Kazuki Ishikawa 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: 8459288Abstract: A regulator for gas having a diaphragm rod held at the center of a diaphragm of which rim is sandwiched between a body and a cover via diaphragm retainers, and a valve element capable of seating itself at a valve seat fixedly placed in the body with a valve hole opening at the center provided in an intermediate portion of a valve shaft having its one end detachably coupled to the diaphragm rod and its other end slidably fitted in a guide opening provided on the body side, wherein the body (34) is equipped with a valve action unit (120) formed by assembling in advance a valve seat member (100) having a valve hole (111) and the valve seat (112) provided thereon, a guide member (106) having a guide opening (105) and pressed into the valve seat member (100), and a valve shaft (114) having a valve element (113) provided thereon in a state of having one end of the valve shaft (114) projected from the valve hole (111) and the other end of the valve shaft (114) slidably fitted into the guide opening (105) It is thereType: GrantFiled: April 1, 2011Date of Patent: June 11, 2013Assignee: Keihin CorporationInventor: Kazuki Ishikawa
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Patent number: 8442014Abstract: A wireless base station apparatus for performing wireless communication with a plurality of wireless communication apparatuses includes a communication processing unit for allocating wireless resources to the wireless communication apparatuses to perform wireless communication, a statistics processing unit for obtaining information related to communication status of the wireless communication apparatuses in wireless communication, and an intermittent arrangement determination unit for detecting a wireless communication apparatus to be allocated with wireless resource at intervals of a predetermined number of communication frames based on the information obtained. The communication processing unit intermittently allocates the same time slot to a plurality of wireless communication apparatuses detected by the intermittent arrangement determination unit at intervals of a predetermined number of communication frames.Type: GrantFiled: August 27, 2009Date of Patent: May 14, 2013Assignee: Kyocera CorporationInventor: Kazuki Ishikawa
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Publication number: 20110174388Abstract: A regulator for gas having a diaphragm rod held at the center of a diaphragm of which rim is sandwiched between a body and a cover via diaphragm retainers, and a valve element capable of seating itself at a valve seat fixedly placed in the body with a valve hole opening at the center provided in an intermediate portion of a valve axis having its one end detachably coupled to the diaphragm rod and its other end slidably fitted in a guide opening provided on the body side, wherein the body (34) is equipped with a valve action unit (120) formed by assembling in advance a valve seat member (100) having a valve hole (111) and the valve seat (112) provided thereon, a guide member (106) having a guide opening (105) and pressed into the valve seat member (100), and a valve axis (114) having a valve element (113) provided thereon in a state of having one end of the valve axis (114) projected from the valve hole (111) and the other end of the valve axis (114) slidably fitted into the guide opening (105) It is thereby pType: ApplicationFiled: April 1, 2011Publication date: July 21, 2011Applicant: KEIHIN CORPORATIONInventor: Kazuki ISHIKAWA
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Publication number: 20110149923Abstract: A wireless base station apparatus for performing wireless communication with a plurality of wireless communication apparatuses includes a communication processing unit for allocating wireless resources to the wireless communication apparatuses to perform wireless communication, a statistics processing unit for obtaining information related to communication status of the wireless communication apparatuses in wireless communication, and an intermittent arrangement determination unit for detecting a wireless communication apparatus to be allocated with wireless resource at intervals of a predetermined number of communication frames based on the information obtained. The communication processing unit intermittently allocates the same time slot to a plurality of wireless communication apparatuses detected by the intermittent arrangement determination unit at intervals of a predetermined number of communication frames.Type: ApplicationFiled: August 27, 2009Publication date: June 23, 2011Applicant: KYOCERA CORPORATIONInventor: Kazuki Ishikawa
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Patent number: 7481412Abstract: A solenoid-operated cutoff valve for use with fuel cells has a movable member disposed in a guide housing for displacement upon energization of a solenoid. When the movable member is displaced, a pilot valve is unseated from a pilot valve seat. A fluid in a communication chamber flows through a pilot passage into an output port. The communication chamber is divided into a first communication chamber and a second communication chamber by a diaphragm. Under a pressure difference developed between the first communication chamber and the second communication chamber, a main valve of a valve head is unseated from a valve seat of a valve housing, opening the solenoid-operated cutoff valve.Type: GrantFiled: November 30, 2005Date of Patent: January 27, 2009Assignee: Keihin CorporationInventors: Kazuki Ishikawa, Yoshio Saito, Toshiaki Kamo, Katsumi Sahoda, Osamu Ichikawa, Kouji Miyano, Tatsuya Sugawara
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Publication number: 20080047618Abstract: A regulator for gas having a diaphragm rod held at the center of a diaphragm of which rim is sandwiched between a body and a cover via diaphragm retainers, and a valve element capable of seating itself at a valve seat fixedly placed in the body with a valve hole opening at the center provided in an intermediate portion of a valve axis having its one end detachably coupled to the diaphragm rod and its other end slidably fitted in a guide opening provided on the body side, wherein the body (34) is equipped with a valve action unit (120) formed by assembling in advance a valve seat member (100) having a valve hole (111) and the valve seat (112) provided thereon, a guide member (106) having a guide opening (105) and pressed into the valve seat member (100), and a valve axis (114) having a valve element (113) provided thereon in a state of having one end of the valve axis (114) projected from the valve hole (111) and the other end of the valve axis (114) slidably fitted into the guide opening (105).Type: ApplicationFiled: February 9, 2005Publication date: February 28, 2008Applicant: KEIHIN CORPORATIONInventor: Kazuki Ishikawa
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Patent number: 7192665Abstract: A regulator for use with fuel cells, which is mounted in a pressure controller of a fuel cell system, has a first diaphragm flexible under the pressure of pilot air supplied as an oxidizing agent to a pilot chamber, a second diaphragm flexible under the pressure of a hydrogen-containing gas flowing through a fluid passage, and a rod connected to a valve head. The spring force of a first spring is set to a value greater than the spring force of a second spring. The regulator is of a normally closed type in which the valve head is seated on a valve seat when the pilot air is not supplied to the pilot chamber.Type: GrantFiled: December 1, 2003Date of Patent: March 20, 2007Assignee: Keihin CorporationInventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
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Patent number: 7157168Abstract: A back pressure chamber is defined at an end of a rod for acting in a direction to cancel out a pressure applied to a valve head, and an aspirator chamber is defined closely to the valve head for developing a pressure lower than a secondary pressure due to a suction caused by a nozzle. The rod has a first communication hole and a second communication hole that are defined therein which provides fluid communication between the back pressure chamber and the aspirator chamber.Type: GrantFiled: December 1, 2003Date of Patent: January 2, 2007Assignee: Keihin CorporationInventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
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Publication number: 20060163513Abstract: A solenoid-operated cutoff valve for use with fuel cells has a movable member disposed in a guide housing for displacement upon energization of a solenoid. When the movable member is displaced, a pilot valve is unseated from a pilot valve seat. A fluid in a communication chamber flows through a pilot passage into an output port. The communication chamber is divided into a first communication chamber and a second communication chamber by a diaphragm. Under a pressure difference developed between the first communication chamber and the second communication chamber, a main valve of a valve head is unseated from a valve seat of a valve housing, opening the solenoid-operated cutoff valve.Type: ApplicationFiled: November 30, 2005Publication date: July 27, 2006Applicant: Keihin CorporationInventors: Kazuki Ishikawa, Yoshio Saito, Toshiaki Kamo, Katsumi Sahoda, Osamu Ichikawa, Kouji Miyano, Tatsuya Sugawara
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Publication number: 20060141298Abstract: A first port for introducing hydrogen is defined in a side wall of a first valve body, and a hot water passage for passing therethrough hot water to heat a region in the vicinity of the first port is defined in the first valve body above the first port. The first valve body has a recess defined therein at a position facing a valve head of a valve mechanism, providing a clearance between the valve head and the first valve body when the valve head is unseated from a seating surface. A solenoid unit includes a movable core having a land which faces a recess defined in a shaft guide. An elastic member made of an elastic material is mounted on the land.Type: ApplicationFiled: November 30, 2005Publication date: June 29, 2006Applicant: Keihin CorporationInventors: Kazuki Ishikawa, Yoshio Saito, Takashi Iwamura, Hiroyasu Ozaki, Tatsuya Sugawara
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Publication number: 20060127722Abstract: A regulator for use with fuel cells, which is mounted in a pressure controller of a fuel cell system, has a first diaphragm flexible under the pressure of pilot air supplied as an oxidizing agent to a pilot chamber, a second diaphragm flexible under the pressure of a hydrogen-containing gas flowing through a fluid passage, and a rod connected to a valve head. The spring force of a first spring is set to a value greater than the spring force of a second spring. The regulator is of a normally closed type in which the valve head is seated on a valve seat when the pilot air is not supplied to the pilot chamber.Type: ApplicationFiled: December 1, 2003Publication date: June 15, 2006Applicant: Keihin CorporationInventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
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Patent number: 6846212Abstract: In fuel supply system for an engine in which a discharge port in a fuel pump driven by the engine to draw up fuel in a fuel tank is connected to an inlet port which is provided in a fuel reservoir and which is controlled in opening and closing by a float valve so that the fuel in the fuel reservoir is supplied to the engine, a second discharge port is provided in the fuel pump, and a second inlet port without a float valve is provided in the fuel reservoir. The second discharge port and the second inlet port are connected to each other through a control valve opened during starting of the engine. Thus, when the engine is started, fuel vapor generated in a pump chamber in the fuel pump can be discharged to the fuel reservoir having an air vent, to normalize the function of the fuel pump, leading to an enhancement in hot startability of the engine.Type: GrantFiled: May 14, 2002Date of Patent: January 25, 2005Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Tetsu Wada, Tomonori Ikuma, Sadafumi Shidara, Makoto Sakai, Kazuki Ishikawa, Nobuhiro Takahashi
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Publication number: 20040231726Abstract: A back pressure chamber is defined at an end of a rod for acting in a direction to cancel out a pressure applied to a valve head, and an aspirator chamber is defined closely to the valve head for developing a pressure lower than a secondary pressure due to a suction caused by a nozzle. The rod has a first communication hole and a second communication hole that are defined therein which provides fluid communication between the back pressure chamber and the aspirator chamber.Type: ApplicationFiled: December 1, 2003Publication date: November 25, 2004Applicant: Keihin CorporationInventors: Yoji Nakajima, Kazuki Ishikawa, Takashi Yoshida, Katsumi Sahoda, Kouji Miyano
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Patent number: 6629544Abstract: A gas pressure-reducing valve includes a pressure-reducing chamber for generating a gas pressure that acts on one surface of a diaphragm, a valve body that can sit on a valve seat having in its central part a valve hole communicating with the pressure-reducing chamber, and a spring biasing the diaphragm in a direction that detaches the valve body from the valve seat. A valve housing is formed by conjoining a body, a partition, and a cover. The partition forms the pressure-reducing chamber between itself and the body and forms a pressure action chamber between itself and the diaphragm. The cover forms the spring chamber between itself and the other surface of the diaphragm and has the peripheral edge of the diaphragm clamped between itself and the partition. The partition has a through hole for allowing the valve stem to run through in an airtight and axially slidable manner and a communicating hole for providing communication between the pressure action chamber and the pressure-reducing chamber.Type: GrantFiled: December 7, 2001Date of Patent: October 7, 2003Assignee: Keihin CorporationInventors: Youji Nakajima, Kazuki Ishikawa, Yoshio Saito
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Patent number: 6568375Abstract: A vehicle gaseous fuel supply system includes a high pressure filter, a primary pressure-reducing valve, a solenoid cut-off valve, safety means, and a secondary pressure-reducing valve. A regulator is formed by disposing the high pressure filter, the solenoid cut-off valve, and the primary pressure-reducing valve on a common regulator body that has a passage providing a connection between the high pressure filter and the solenoid cut-off valve, a passage providing a connection between the solenoid cut-off valve and the primary pressure-reducing valve, and an exit passage having one end connected to the primary pressure-reducing valve. Between the safety means and the secondary pressure-reducing valve which are connected to the other end of the exit passage, at least the secondary pressure-reducing valve has its valve housing formed as a body separate from the regulator body.Type: GrantFiled: December 10, 2001Date of Patent: May 27, 2003Assignee: Keihin CorporationInventors: Kazuki Ishikawa, Youji Nakajima
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Publication number: 20030008572Abstract: In fuel supply system for an engine in which a discharge port in a fuel pump driven by the engine to draw up fuel in a fuel tank is connected to an inlet port which is provided in a fuel reservoir and which is controlled in opening and closing by a float valve so that the fuel in the fuel reservoir is supplied to the engine, a second discharge port is provided in the fuel pump, and a second inlet port without a float valve is provided in the fuel reservoir. The second discharge port and the second inlet port are connected to each other through a control valve opened during starting of the engine. Thus, when the engine is started, fuel vapor generated in a pump chamber in the fuel pump can be discharged to the fuel reservoir having an air vent, to normalize the function of the fuel pump, leading to an enhancement in hot startability of the engine.Type: ApplicationFiled: May 14, 2002Publication date: January 9, 2003Inventors: Tetsu Wada, Tomonori Ikuma, Sadafumi Shidara, Makoto Sakai, Kazuki Ishikawa, Nobuhiro Takahashi
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Publication number: 20020083932Abstract: A vehicle gaseous fuel supply system includes a high pressure filter, a primary pressure-reducing valve, a solenoid cut-off valve, safety means, and a secondary pressure-reducing valve. A regulator is formed by disposing the high pressure filter, the solenoid cut-off valve, and the primary pressure-reducing valve on a common regulator body that has a passage providing a connection between the high pressure filter and the solenoid cut-off valve, a passage providing a connection between the solenoid cut-off valve and the primary pressure-reducing valve, and an exit passage having one end connected to the primary pressure-reducing valve. Between the safety means and the secondary pressure-reducing valve which are connected to the other end of the exit passage, at least the secondary pressure-reducing valve has its valve housing formed as a body separate from the regulator body.Type: ApplicationFiled: December 10, 2001Publication date: July 4, 2002Inventors: Kazuki Ishikawa, Youji Nakajima
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Publication number: 20020083980Abstract: A gas pressure-reducing valve includes a pressure-reducing chamber for generating a gas pressure that acts on one surface of a diaphragm, a valve body that can sit on a valve seat having in its central part a valve hole communicating with the pressure-reducing chamber, and a spring biasing the diaphragm in a direction that detaches the valve body from the valve seat. A valve housing is formed by conjoining a body, a partition, and a cover. The partition forms the pressure-reducing chamber between itself and the body and forms a pressure action chamber between itself and the diaphragm. The cover forms the spring chamber between itself and the other surface of the diaphragm and has the peripheral edge of the diaphragm clamped between itself and the partition. The partition has a through hole for allowing the valve stem to run through in an airtight and axially slidable manner and a communicating hole for providing communication between the pressure action chamber and the pressure-reducing chamber.Type: ApplicationFiled: December 7, 2001Publication date: July 4, 2002Inventors: Youji Nakajima, Kazuki Ishikawa, Yoshio Sato
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Patent number: 6176256Abstract: A gas pressure-reducing valve in which a valve member to be seated on a valve seat having a valve hole opened at its central portion and leading to a pressure-reducing chamber between a body and a diaphragm is fixed on a valve stem connected to the central portion of the diaphragm and arranged coaxially with the valve axis. A bottomed mounting bore which is aligned with the valve axis and opened toward the pressure-reducing chamber is formed in the body. A cylindrical valve seat member forming a valve chamber between itself and the closed end of the mounting bore for accommodating the valve member and inserted into the mounting bore is fixed on the body. A valve seat facing the valve chamber is formed on the inner surface of the end portion of the valve seat member on the side of the pressure-reducing chamber. This arrangement makes it possible to reduce the number of parts and to enhance the degree of freedom for the arrangement of the parts in the body.Type: GrantFiled: March 23, 1999Date of Patent: January 23, 2001Assignees: Keihin Corporation, Honda Giken Kogyo Kabushiki KaishaInventors: Yoji Nakajima, Hiroyuki Iwasaki, Kazuki Ishikawa, Yoshio Saito, Nobuo Arai, Hiroyuki Goto, Shuichi Togasawa
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Patent number: 6155290Abstract: A gas pressure-reducing valve in which a valve member to be seated on a valve seat opened at its central portion with a valve hole leading to a pressure-reducing chamber between a body and a diaphragm is fixed on a valve stem coaxially extending through the valve hole, and in which the valve stem is fastened to a fastened member fixed on the central portion of the diaphragm. The fastened member is provided with a fitting bore opened at its one end on the side of the valve stem and a bottom threaded bore having a diameter smaller than that of the fitting bore and coaxially leading to the other end of the fitting bore. The valve stem is provided at its end portion on the side of the diaphragm with a fitting stem portion to be fitted in the fitting bore and an externally threaded portion capable of being screwed in the threaded bore and coaxially leading to the fitting stem portion. The externally threaded portion has a shorter axial length than that of the fitting bore.Type: GrantFiled: March 23, 1999Date of Patent: December 5, 2000Assignee: Keihin CorporationInventors: Yoji Nakajima, Kazuki Ishikawa, Yoshio Saito, Hiroyuki Iwasaki