Patents by Inventor Ryosuke Dohi
Ryosuke Dohi 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: 8162286Abstract: Stable flow control is made possible even under high-temperature environments by relieving tensional force applied to a piezoelectric element when a piezoelectric actuator is retracted. Thus, a piezoelectric driven control valve includes: a body having a valve seat; a metal diaphragm to contact with and separate from the valve seat; an actuator box supported ascendably and descendably on the body; a split base fixed to the body; a disc spring pressing and urging the actuator box downward to bring the metal diaphragm into contact with the valve seat; and a piezoelectric actuator housed inside the actuator box and that extends upward with application of voltage to press the actuator box upward against the elastic force of the disc spring, and a precompression mechanism, for applying a compression force constantly to piezoelectric elements in the piezoelectric actuator, provided between the split base and the piezoelectric actuator.Type: GrantFiled: March 13, 2008Date of Patent: April 24, 2012Assignee: Fujikin IncorporatedInventors: Yohei Sawada, Kaoru Hirata, Ryosuke Dohi, Kouji Nishino, Nobukazu Ikeda
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Patent number: 7059363Abstract: A method for supplying a specified quantity Q of processing gas while dividing at a desired flow rate ratio Q1/Q2 accurately and quickly from a gas supply facility equipped with a flow controller into a chamber. When a specified quantity Q of gas is supplied while being divided at a desired flow rate ratio Q1/Q2 from a gas supply facility equipped with a flow controller into a reduced pressure chamber C through a plurality of branch supply lines and shower plates fixed to the ends thereof, pressure type division quantity controllers FV1 and FV2 are provided in the plurality of branch supply lines GL1 and GL2.Type: GrantFiled: January 20, 2003Date of Patent: June 13, 2006Assignees: Fujikin Incorporated, Tokyo Electron Ltd.Inventors: Kazuhiko Sugiyama, Nobukazu Ikeda, Kouji Nishino, Ryosuke Dohi, Toyomi Uenoyama
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Publication number: 20040144178Abstract: A pressure sensor, a pressure control apparatus, and a flow rate control apparatus are provided in which the temperature drift of the pressure sensor is automatically corrected, and pressure can be accurately detected in spite of changes in temperature.Type: ApplicationFiled: November 7, 2003Publication date: July 29, 2004Inventors: Tadahiro Ohmi, Tomio Uno, Osamu Nakamura, Nobukazu Ikeda, Ryosuke Dohi, Kouji Nishino, Atsushi Matsumoto, Kazuhiko Sugiyama
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Patent number: 6394415Abstract: A fluid control valve, which can control a fluid having a pressure in the order of 10 kg/cm2, has a response time in the order of several milliseconds can be made small in size, and a fluid supply/exhaust system that provides less gas counter flow in the event of a plurality of valves being used. A fluid control valve of the invention controls a fluid moving in a valve body by closing and opening a portion between a valve seat and a valve holder by use of a drive unit. The drive unit has a rod-shaped shaft for application of pressure through the valve seat and the valve holder, and a member “a” fixed around the rod-shaped shaft. The member “a” is made from a magnetic material, and has a space between it and the shaft. A coil provided in parallel to the shaft, moves the shaft via the member “a” up and down by electromagnetic induction, and makes use of a spring force to close and open a portion between the valve seat and the valve holder.Type: GrantFiled: July 27, 2000Date of Patent: May 28, 2002Assignees: Fujikin, Inc., Tohoku Steel Co., Ltd.Inventors: Tadahiro Ohmi, Migaku Takahashi, Michio Yamaji, Tsuyoshi Tanikawa, Nobukazu Ikeda, Ryosuke Dohi, Kouji Nishino, Naofumi Yasumoto, Hiroyuki Fukuda, Tomio Uno, Yasuyuki Yanai
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Patent number: 6193212Abstract: A fluid control valve, which can control a fluid having a pressure in the order of 10 kg/cm2, has a response time in the order of several milliseconds can be made small in size, and a fluid supply/exhaust system that provides less gas counter flow in the event of a plurality of valves being used. A fluid control valve of the invention controls a fluid moving in a valve body by closing and opening a portion between a valve seat and a valve holder by use of a drive unit. The drive unit has a rod-shaped shaft for application of pressure through the valve seat and the valve holder, and a member “a” fixed around the rod-shaped shaft. The member “a” is made from a magnetic material, and has a space between it and the shaft. A coil provided in parallel to the shaft, moves the shaft via the member “a” up and down by electromagnetic induction, and makes use of a spring force to close and open a portion between the valve seat and the valve holder.Type: GrantFiled: July 23, 1999Date of Patent: February 27, 2001Assignees: Tohoku Steel Co., Ltd., Fujiken Inc.Inventors: Tadahiro Ohmi, Migaku Takahashi, Michio Yamaji, Tsuyoshi Tanikawa, Nobukazu Ikeda, Ryosuke Dohi, Kouji Nishino, Naofumi Yasumoto, Hiroyuki Fukuda, Tomio Uno, Yasuyuki Yanai
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Patent number: 6116092Abstract: A good quality passive-state film is formed on a gas-contact face of a diaphragm of a pressure detector using a sensor chip to prevent corrosion on, or water content emission from, or catalytic action at a gas-contact face, thereby improving production quality in a semiconductor manufacturing process and providing high accuracy pressure detection. The passive-state film is formed on the gas-contact face of the diaphragm when the diaphragm is mounted on a diaphragm base. The diaphragm base is then fixedly secured to a sensor base in which a sensor chip is housed and a pressure transmitting medium is sealed in a gap between the sensor base and the diaphragm base.Type: GrantFiled: August 28, 1997Date of Patent: September 12, 2000Assignee: Fujikin IncorporatedInventors: Tadahiro Ohmi, Ryosuke Dohi, Koji Nishino, Nobukazu Ikeda
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Patent number: 6018136Abstract: A system of the invention for supervising piping work comprises a machine for performing piping work such as welding of pipes or tightening of pipe joints under predetermined conditions, check means for checking whether the piping work has been executed properly based on predetermined values of piping work conditions and actual piping work data, a host computer for accumulating the predetermined values of piping work conditions, the actual piping work data and the result of checking, and communication means for transmitting the predetermined values of piping work conditions, the actual piping work data and the result of checking.Type: GrantFiled: May 20, 1999Date of Patent: January 25, 2000Assignees: Tadahiro OHMI, Fujikin IncorporatedInventors: Tadahiro Ohmi, Ryosuke Dohi, Eiji Ideta, Hiroyuki Fukuda, Hiroshi Morokoshi, Nobukazu Ikeda
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Patent number: 5981905Abstract: A system of the invention for supervising piping work comprises a machine for performing piping work such as welding of pipes or tightening of pipe joints under predetermined conditions, check means for checking whether the piping work has been executed properly based on predetermined values of piping work conditions and actual piping work data, a host computer for accumulating the predetermined values of piping work conditions, the actual piping work data and the result of checking, and communication means for transmitting the predetermined values of piping work conditions, the actual piping work data and the result of checking.Type: GrantFiled: May 30, 1997Date of Patent: November 9, 1999Assignees: Tadahiro Ohmi, Fujikin IncorporatedInventors: Tadahiro Ohmi, Ryosuke Dohi, Eiji Ideta, Hiroyuki Fukuda, Hiroshi Morokoshi, Nobukazu Ikeda
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Patent number: 5816285Abstract: A pressure type flow rate control apparatus (1) controls flow rate of a fluid in an environment where a ratio of P2/P1 between an absolute pressure P1 at an upstream side of an orifice and an absolute pressure P2 at a downstream side of the orifice is maintained at a value less than about 0.7.Type: GrantFiled: August 11, 1997Date of Patent: October 6, 1998Assignees: Fujikin Incorporated, Tadahiro OhmiInventors: Tadahiro Ohmi, Koji Nishino, Nobukazu Ikeda, Akihiro Morimoto, Yukio Minami, Koji Kawada, Ryosuke Dohi, Hiroyuki Fukuda
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Patent number: 5791369Abstract: A pressure type flow rate control apparatus (1) for controlling flow rate of a fluid maintains an upstream side pressure P1 of an orifice at more than about twice a downstream side pressure P2. In addition to an orifice-forming member (5) the apparatus includes a control valve (2) provided at the upstream side of the orifice, a pressure detector (3) provided between the control valve and the orifice, and an operation control device (6) for calculating a flow rate Qc from the detected pressure P1 of the pressure detector as Qc=KP1 (K being a constant) and issuing a difference as a control signal Qy between a flow rate command signal Qs and the calculated flow rate Qc to a drive unit of the control valve. The orifice upstream side pressure P1 is adjusted by opening and closing the control valve, thereby controlling the orifice downstream side flow rate.Type: GrantFiled: March 5, 1997Date of Patent: August 11, 1998Assignee: Fujikin IncorporatedInventors: Koji Nishino, Nobukazu Ikeda, Akihiro Morimoto, Yukio Minami, Koji Kawada, Ryosuke Dohi, Hiroyuki Fukuda
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Patent number: 5669408Abstract: A pressure type flow rate control apparatus (1) for controlling flow rate of a fluid maintains an upstream side pressure P1 of an orifice at more than about twice a downstream side pressure P2. In addition to an orifice-forming member (5) the apparatus includes a control valve (2) provided at the upstream side of the orifice, a pressure detector (3) provided between the control valve and the orifice, and an operation control device (6) for calculating a flow rate Qc from the detected pressure P1 of the pressure detector as Qc=KP1 (K being a constant) and issuing a difference as a control signal Qy between a flow rate command signal Qs and the calculated flow rate Qc to a drive unit of the control valve. The orifice upstream side pressure P1 is adjusted by opening and closing the control valve, thereby controlling the orifice downstream side flow rate.Type: GrantFiled: June 10, 1996Date of Patent: September 23, 1997Assignee: Fujikin IncorporatedInventors: Koji Nishino, Nobukazu Ikeda, Akihiro Morimoto, Yukio Minami, Koji Kawada, Ryosuke Dohi, Hiroyuki Fukuda
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Patent number: 5609077Abstract: A tightening device comprises an upper plate, a lower plate disposed below the upper plate in parallel thereto, a nut rotating gear supported by the lower plate so as to be rotatable in a horizontal plane, and a spur gear provided on an underside of the upper plate and meshable with the nut rotating gear for rotating the nut rotating gear. The upper plate has a portion fittable to a flange of an externally threaded member for preventing the rotation of the threaded member, while the nut rotating gear has a portion fittable to a nut. With the nut manually tightened on the threaded member in advance, the flange fitting portion of the upper plate is fitted to the flange, the nut is fitted in the fitting portion of the nut rotating gear, and the spur gear is thereafter rotated, whereby the nut rotating gear is driven to tighten up the nut on the threaded member.Type: GrantFiled: August 20, 1996Date of Patent: March 11, 1997Assignee: Fujikin IncorporatedInventors: Tadahiro Ohmi, Nobukazu Ikeda, Ryosuke Dohi, Kunio Nagai, Eiji Ideta, Koji Nishino, Michio Yamaji, Tsutomu Shinohara, Naofumi Yasumoto
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Patent number: 5502883Abstract: A reference range of tightening torques is predetermined relative to the rotation angle of a threaded member as normally tightened. In tightening up a nut on an externally threaded member, the tightening torque is detected by a torque sensor every time the nut is rotated through a specified angle, and whether the tightening torque relative to the rotation angle is within the reference range is judged by a microcomputer. The result of judgment is indicated by a light-emitting diode and a buzzer.Type: GrantFiled: June 3, 1994Date of Patent: April 2, 1996Assignee: Fujikin IncorporatedInventors: Tadahiro Ohmi, Nobukazu Ikeda, Ryosuke Dohi, Kunio Nagai, Eiji Ideta, Koji Nishino, Michio Yamaji, Tsutomu Shinohara, Naofumi Yasumoto
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Patent number: 4645176Abstract: A control valve comprising a vertical tubular yoke having a bottom wall, a solenoid mounted on the upper end of the yoke for giving a force of attraction the magnitude of which is in proportion to the value of input current, the solenoid having an operating rod directed downward and movable longitudinally thereof by the force of attraction, a valve body connected to the bottom wall of the yoke, a valve stem vertically movably supported by the valve body and having an upper portion extending upward from the valve body into the yoke, and conversion means housed in the yoke for converting the force of attraction acting on the operating rod to a displacement of the valve stem.Type: GrantFiled: July 18, 1985Date of Patent: February 24, 1987Assignee: Fujikin International, Inc.Inventors: Hiroshi Ogawa, Yoshiteru Sonoda, Ryosuke Dohi