Patents by Inventor Kazuko Takeshita
Kazuko Takeshita 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: 8656718Abstract: In a steam system having a turbine driven by steam supplied from a high-pressure header to a low-pressure header, when the pressure in the low-pressure header drops, a turbine bypass valve is opened and the high-pressure side steam is supplied to the low-pressure side header in a normal control. When the turbine is tripped, steam is rapidly flow into the low-pressure side header and its pressure temporally increases. the steam in the low-pressure header is discharged through a discharge valve. After that, if a steam supply from the low-pressure header to another process increases, the discharge valve is closed. After the discharge valve is fully closed, an after-trip control is performed in which the opening of the turbine bypass valve is increased at an earlier timing than the normal control for preventing the steam amount in the low-pressure header to be too small. The control stability of the steam system when the turbine is tripped can be enhanced.Type: GrantFiled: February 14, 2008Date of Patent: February 25, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Kazuko Takeshita, Susumu Kouno, Haruaki Hirayama, Naohiko Ishibashi, Yosuke Nakagawa
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Patent number: 8620483Abstract: A steam system control method applied to a steam system including: a low-pressure header storing low-pressure steam; a high-pressure header storing high-pressure header; a steam turbine connected between them; and a turbine bypass line introducing controlled amount of steam from the high-pressure header to the low-pressure header by bypassing the steam turbine. The low-pressure header has a blow-off valve for discharging excessive steam to the outside. The steam system control method includes: a normal time blow-off valve control step of PI controlling the opening of the blow-off valve; and a trip time blow-off control step of controlling the opening of the blow-off valve by changing the MV value to a predetermined trip time opening set value when the turbine is tripped.Type: GrantFiled: February 14, 2008Date of Patent: December 31, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Kazuko Takeshita, Susumu Kouno, Haruaki Hirayama, Naohiko Ishibashi, Yosuke Nakagawa
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Patent number: 8298758Abstract: The present invention is to provide a multiple detection method that can detect contaminating microorganisms existing in foods, including pathogenic Escherichia coli O157, Listeria monocytogenes and Salmonella spp., with high sensitivity comparable or even superior to official methods, comprising the steps of amplifying a plural number of target genes with a single PCR reaction tube and analyzing the same. The following steps are performed consecutively: (A) a step of extracting DNA of the target microorganisms to be detected by treating with at least a lytic enzyme such as Achromopepidase and Lysozyme and/or bacteriocin having lytic activity such as Enterolysine, a surfactant and a protein denaturing agent; and (B) a step of mixing a specific primer to the target microorganisms to be detected to perform multiplex PCR. Further, it is preferable to add a step of culturing with a culture condition where 1 CFU/100 g microorganisms becomes 10.sup.Type: GrantFiled: December 24, 2004Date of Patent: October 30, 2012Assignees: Prima Meat Packers, Ltd., National Agriculture and Food Research OrganizationInventors: Naoko Horikoshi, Susumu Kawasaki, Yukio Okada, Kazuko Takeshita, Takashi Sameshima, Shinichi Kawamoto, Kenji Isshiki
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Patent number: 7996183Abstract: A performance monitoring apparatus for a fluid machinery which includes a predicted performance curve calculator for obtaining a curve representing the relationship between a pressure coefficient and a flow coefficient by non-dimensional characteristics per a plural fluid control quantities from a compression ratio or a pressure difference and an inlet flow rate of the fluid machinery, and a performance monitoring calculator for obtaining an actual performance head from fluid control quantities, a suction pressure, a discharge pressure, a suction temperature, a compression coefficient, a gas average molecular weight, and a specific heat ratio at the time of the operating fluid machinery, and obtaining a predicted performance head from a predicted performance curve, fluid control quantities, and an inlet flow rate; and calculating a performance degradation from the ratio of the predicted performance head to the actual performance head.Type: GrantFiled: April 18, 2006Date of Patent: August 9, 2011Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Kazuhiro Takeda, Shinji Ogino, Kazuko Takeshita
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Publication number: 20100161136Abstract: A steam system control method applied to a steam system including: a low-pressure header storing low-pressure steam; a high-pressure header storing high-pressure header; a steam turbine connected between them; and a turbine bypass line introducing controlled amount of steam from the high-pressure header to the low-pressure header by bypassing the steam turbine. The low-pressure header has a blow-off valve for discharging excessive steam to the outside. The steam system control method includes: a normal time blow-off valve control step of PI controlling the opening of the blow-off valve; and a trip time blow-off control step of controlling the opening of the blow-off valve by changing the MV value to a predetermined trip time opening set value when the turbine is tripped.Type: ApplicationFiled: February 14, 2008Publication date: June 24, 2010Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kazuko Takeshita, Susumu Kouno, Haruaki Hirayama, Naohiko Ishibashi, Yosuke Nakagawa
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Publication number: 20090288414Abstract: In a steam system having a turbine driven by steam supplied from a high-pressure header to a low-pressure header, when the pressure in the low-pressure header drops, a turbine bypass valve is opened and the high-pressure side steam is supplied to the low-pressure side header in a normal control. When the turbine is tripped, steam is rapidly flow into the low-pressure side header and its pressure temporally increases. the steam in the low-pressure header is discharged through a discharge valve. After that, if a steam supply from the low-pressure header to another process increases, the discharge valve is closed. After the discharge valve is fully closed, an after-trip control is performed in which the opening of the turbine bypass valve is increased at an earlier timing than the normal control for preventing the steam amount in the low-pressure header to be too small. The control stability of the steam system when the turbine is tripped can be enhanced.Type: ApplicationFiled: February 14, 2008Publication date: November 26, 2009Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kazuko Takeshita, Susumu Kouno, Haruaki Hirayama, Naohiko Ishibashi, Yosuke Nakagawa
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Patent number: 7556473Abstract: The present invention includes an inflow quantity regulating means 5 for regulating the inflow quantity of a fuel gas to a compressor 1; a recycle valve 7 for returning the fuel gas discharged from the compressor 1 to the inlet side of the compressor 1; and a control means which sets a control operating value for operating the compressor 1 at a predetermined operation point, and controls the inflow quantity regulating means 5 and the recycle valve 7 based on the control operating value. The control means has a first control signal generating means 27 which generates a signal increasing with an increase in the operating value as a control signal for the inflow quantity regulating means 5 when the control operating value is a predetermined value or larger and a second control signal generating means 29 which generates a signal decreasing with an increase in the operating value as a control signal for the recycle valve 7 when the control operating value is smaller than the predetermined value.Type: GrantFiled: August 27, 2004Date of Patent: July 7, 2009Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Kazuko Takeshita, Kazuhiro Takeda, Susumu Kouno, Jun Nakamura, Kenichiro Nakamura
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Publication number: 20090150121Abstract: A performance monitoring apparatus for a fluid machinery which includes a predicted performance curve calculator for obtaining a curve representing the relationship between a pressure coefficient and a flow coefficient by non-dimensional characteristics per a plural fluid control quantities from a compression ratio or a pressure difference and an inlet flow rate of the fluid machinery, and a performance monitoring calculator for obtaining an actual performance head from fluid control quantities, a suction pressure, a discharge pressure, a suction temperature, a compression coefficient, a gas average molecular weight, and a specific heat ratio at the time of the operating fluid machinery, and obtaining a predicted performance head from a predicted performance curve, fluid control quantities, and an inlet flow rate; and calculating a performance degradation from the ratio of the predicted performance head to the actual performance head.Type: ApplicationFiled: April 18, 2006Publication date: June 11, 2009Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kazuhiro Takeda, Shinji Ogino, Kazuko Takeshita
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Patent number: 7472541Abstract: Provided is a compressor control unit with a high response ability to changes of gas condition of a compressor (compressor suction temperature, pressure, gas specific gravity, pressure ratio of suction pressure and discharge pressure). In the control unit for a compressor that supplies gas into a gas turbine through a header tank, an inlet gas condition is measured and a load command value from a gas turbine controller is corrected to be increased or decreased corresponding to the measured inlet gas condition.Type: GrantFiled: November 7, 2005Date of Patent: January 6, 2009Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Kazuhiro Takeda, Kazuko Takeshita, Makoto Tsutsui, Hiroaki Yoshida, Kengo Hirano
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Publication number: 20080014578Abstract: The present invention is to provide a multiple detection method that can detect contaminating microorganisms existing in foods, including pathogenic Escherichia coli O157, Listeria monocytogenes and Salmonella spp., with high sensitivity comparable or even superior to official methods, comprising the steps of amplifying a plural number of target genes with a single PCR reaction tube and analyzing the same. The following steps are performed consecutively: (A) a step of extracting DNA of the target microorganisms to be detected by treating with at least a lytic enzyme such as Achromopepidase and Lyzocyme and/or bacteriocin having lytic activity such as Enterolysine, a surfactant and a protein denaturing agent; and (B) a step of mixing a specific primer to the target microorganisms to be detected to perform multiplex PCR.Type: ApplicationFiled: December 24, 2004Publication date: January 17, 2008Inventors: Naoko Horikoshi, Susumu Kawasaki, Yukio Okada, Kazuko Takeshita, Takashi Sameshima, Shinichi Kawamoto, Kenji Isshiki
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Publication number: 20070110587Abstract: The present invention includes an inflow quantity regulating means 5 for regulating the inflow quantity of a fuel gas to a compressor 1; a recycle valve 7 for returning the fuel gas discharged from the compressor 1 to the inlet side of the compressor 1; and a control means which sets a control operating value for operating the compressor 1 at a predetermined operation point, and controls the inflow quantity regulating means 5 and the recycle valve 7 based on the control operating value. The control means has a first control signal generating means 27 which generates a signal increasing with an increase in the operating value as a control signal for the inflow quantity regulating means 5 when the control operating value is a predetermined value or larger and a second control signal generating means 29 which generates a signal decreasing with an increase in the operating value as a control signal for the recycle valve 7 when the control operating value is smaller than the predetermined value.Type: ApplicationFiled: August 27, 2004Publication date: May 17, 2007Inventor: Kazuko Takeshita
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Publication number: 20060101824Abstract: Provided is a compressor control unit with a high response ability to changes of gas condition of a compressor (compressor suction temperature, pressure, gas specific gravity, pressure ratio of suction pressure and discharge pressure). In the control unit for a compressor that supplies gas into a gas turbine through a header tank, an inlet gas condition is measured and a load command value from a gas turbine controller is corrected to be increased or decreased corresponding to the measured inlet gas condition.Type: ApplicationFiled: November 7, 2005Publication date: May 18, 2006Inventors: Kazuhiro Takeda, Kazuko Takeshita, Makoto Tsutsui, Hiroaki Yoshida, Kengo Hirano
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Patent number: 6868294Abstract: In the NH3 injection rate control method for an NOx removal apparatus, operating area of the apparatus is divided into first area in which molar ratio of NH3 injection rate with respect to NOx flow rate at an inlet of the apparatus is smaller than molar ratio at minimum point where NOx concentration assumes minimum value and second area in which the molar ratio is equal to or larger than the minimum point molar ratio, and virtual NOx concentration with respect to the molar ratio is set according to virtual characteristic line which varies monotonically to stride across desired operating point without rising with increase of the molar ratio from the first area to the second area. Moreover, feedback control is implemented for adjusting the NH3 injection rate with respect to the NOx flow rate in direction that the virtual NOx concentration is brought close to the desired NOx concentration.Type: GrantFiled: January 8, 2003Date of Patent: March 15, 2005Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Susumu Kouno, Kenji Suzuki, Kazuko Takeshita, Kozo Iida, Toshiyuki Onishi, Akira Hattori
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Publication number: 20030145601Abstract: In the NH3 injection rate control method for an NOx removal apparatus, operating area of the apparatus is divided into first area in which molar ratio of NH3 injection rate with respect to NOx flow rate at an inlet of the apparatus is smaller than molar ratio at minimum point where NOx concentration assumes minimum value and second area in which the molar ratio is equal to or larger than the minimum point molar ratio, and virtual NOx concentration with respect to the molar ratio is set according to virtual characteristic line which varies monotonically to stride across desired operating point without rising with increase of the molar ratio from the first area to the second area. Moreover, feedback control is implemented for adjusting the NH3 injection rate with respect to the NOx flow rate in direction that the virtual NOx concentration is brought close to the desired NOx concentration.Type: ApplicationFiled: January 8, 2003Publication date: August 7, 2003Applicant: MITSUBISHI HEAVY INDUSTRIES LTD.Inventors: Susumu Kouno, Kenji Suzuki, Kazuko Takeshita, Kozo Iida, Toshiyuki Onishi, Akira Hattori