Patents by Inventor Naotsugu Seko
Naotsugu Seko 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: 10605636Abstract: A flowmeter including a sensor passage disposed with a sensor chip for measuring a flow rate and an orifice passage as a bypass passage placed with respect to the sensor passage is provided. The orifice passage has a passage diameter which is smaller than a passage diameter of an inflow passage, a distribution orifice is placed on an inlet side of the sensor passage, and the orifice passage and the distribution orifice are configured such that changing trends in an effective sectional area becomes same in a graph including a vertical axis indicating the effective sectional area and a lateral axis indicating a fluid pressure of a fluid.Type: GrantFiled: June 13, 2018Date of Patent: March 31, 2020Assignee: CKD CORPORATIONInventors: Ryo Eguchi, Naotsugu Seko, Kazutoshi Ito
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Publication number: 20190277675Abstract: A flowmeter including a sensor passage disposed with a sensor chip for measuring a flow rate and an orifice passage as a bypass passage placed with respect to the sensor passage is provided. The orifice passage has a passage diameter which is smaller than a passage diameter of an inflow passage, a distribution orifice is placed on an inlet side of the sensor passage, and the orifice passage and the distribution orifice are configured such that changing trends in an effective sectional area becomes same in a graph including a vertical axis indicating the effective sectional area and a lateral axis indicating a fluid pressure of a fluid.Type: ApplicationFiled: June 13, 2018Publication date: September 12, 2019Applicant: CKD CORPORATIONInventors: Ryo EGUCHI, Naotsugu SEKO, Kazutoshi ITO
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Patent number: 7748684Abstract: The invention has been made to provide a flow control valve capable of preventing adhesion between a fixed core and a movable core and increasing an attractive force, so that flow control can be performed with high accuracy. In a flow control valve 10, a first fixed core 23a is fixed in an upper part of a coil bobbin 21, a second fixed core 23b is fixed in a lower part of the coil bobbin 21, and the movable core 24 is formed at its lower end with a flange 24a having a diameter larger than an inner diameter of the coil bobbin 21. The movable core 24 is placed inside a cylindrical part 28a of the flared pipe 28 so that a distance D1 between the first fixed core 23a and the movable core 24 is larger than a distance D2 between the flange 24a and a disc part 28b of the flared pipe 28.Type: GrantFiled: June 20, 2006Date of Patent: July 6, 2010Assignee: CKD CorporationInventors: Akihiro Ito, Naotsugu Seko, Yoshihiro Matsuoka, Manami Niwa
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Publication number: 20090045366Abstract: The invention has been made to provide a flow control valve capable of preventing adhesion between a fixed core and a movable core and increasing an attractive force, so that flow control can be performed with high accuracy. In a flow control valve 10, a first fixed core 23a is fixed in an upper part of a coil bobbin 21, a second fixed core 23b is fixed in a lower part of the coil bobbin 21, and the movable core 24 is formed at its lower end with a flange 24a having a diameter larger than an inner diameter of the coil bobbin 21. The movable core 24 is placed inside a cylindrical part 28a of the flared pipe 28 so that a distance D1 between the first fixed core 23a and the movable core 24 is larger than a distance D2 between the flange 24a and a disc part 28b of the flared pipe 28.Type: ApplicationFiled: June 20, 2006Publication date: February 19, 2009Inventors: Akihiro Ito, Naotsugu Seko, Yoshihiro Matsuoka, Manami Niwa
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Patent number: 6928865Abstract: The present invention relates to a thermal flowmeter capable of sensing a flow rate in either direction, having a linear output characteristic, and producing a stable output without impairing the response characteristic. In the thermal flowmeter, a laminate is fitted in a channel space formed in a body, forming a main channel. The laminate includes a mesh sheet so that a mesh portion is provided between the main channel and a sensor channel. A measurement chip is provided with an upstream temperature sensing resistor, a downstream temperature sensing resistor, a heating resistor, and a fluid temperature sensing resistor. By an electric circuit, the heating resistor and the fluid temperature sensing resistor are controlled to provide a constant temperature difference. Accordingly, the flow rate of a fluid under measurement is measured based on a temperature difference between the upstream and downstream temperature sensing resistors.Type: GrantFiled: November 8, 2004Date of Patent: August 16, 2005Assignee: CKD CorporationInventors: Akihiro Ito, Naotsugu Seko
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Patent number: 6886401Abstract: A laminated filter is fit in a passage space formed in a body. The laminated filter is made of a mesh plate including a mesh part, a first blocking plate including a blocking part, a second blocking plate including a blocking part, and a third blocking plate including a blocking part which are arbitrarily combined and layered. Accordingly, a three-layered mesh part is placed between a main passage and a sensor passage and a blocking wall is constructed of the three blocking parts.Type: GrantFiled: February 26, 2003Date of Patent: May 3, 2005Assignee: CKD CorporationInventors: Akihiro Ito, Naotsugu Seko, Shigeru Hayashimoto, Shoichi Kitagawa
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Publication number: 20050081620Abstract: The present invention relates to a thermal flowmeter capable of sensing a flow rate in either direction, having a linear output characteristic, and producing a stable output without impairing the response characteristic. In the thermal flowmeter, a laminate is fitted in a channel space formed in a body, forming a main channel. The laminate includes a mesh sheet so that a mesh portion is provided between the main channel and a sensor channel. A measurement chip is provided with an upstream temperature sensing resistor, a downstream temperature sensing resistor, a heating resistor, and a fluid temperature sensing resistor. By an electric circuit, the heating resistor and the fluid temperature sensing resistor are controlled to provide a constant temperature difference. Accordingly, the flow rate of a fluid under measurement is measured based on a temperature difference between the upstream and downstream temperature sensing resistors.Type: ApplicationFiled: November 8, 2004Publication date: April 21, 2005Applicant: CKD CORPORATIONInventors: Akihiro Ito, Naotsugu Seko
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Publication number: 20040163461Abstract: A laminated filter is fit in a passage space formed in a body. The laminated filter is made of a mesh plate including a mesh part, a first blocking plate including a blocking part, a second blocking plate including a blocking part, and a third blocking plate including a blocking part which are arbitrarily combined and layered. Accordingly, a three-layered mesh part is placed between a main passage and a sensor passage and a blocking wall is constructed of the three blocking parts.Type: ApplicationFiled: February 26, 2003Publication date: August 26, 2004Applicant: CKD CORPORATIONInventors: Akihiro Ito, Naotsugu Seko, Shigeru Hayashimoto, Shoichi Kitagawa