Patents by Inventor Toshiyuki Obata
Toshiyuki Obata 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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Publication number: 20170294761Abstract: A laser diode with an improved kink level in the L-I characteristic and capable of obtaining a stable high output in a horizontal transverse mode is provided. The laser diode includes an active layer made of nitride III-V compound semiconductor containing at least gallium (Ga) in 3B-group elements and at least nitrogen (N) in 5B-group elements, an n-type compound semiconductor layer provided on one of faces of the active layer, and a p-type compound semiconductor layer provided on the other face of the active layer. A region closest to the active layer, in the n-type compound semiconductor layer is a high-concentration region whose impurity concentration is higher than that of the other n-type regions.Type: ApplicationFiled: April 24, 2017Publication date: October 12, 2017Inventors: Toshiyuki Obata, Hidekazu Kawanishi
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Patent number: 9748410Abstract: A vertical nitride semiconductor device includes an n-type aluminum nitride single-crystal substrate having an Si content of 3×1017 to 1×1020 cm?3 and a dislocation density of 106 cm?2 or less. An ohmic electrode layer is formed on an N-polarity side of the n-type aluminum nitride single-crystal substrate.Type: GrantFiled: October 15, 2014Date of Patent: August 29, 2017Assignee: Tokuyama CorporationInventors: Toru Kinoshita, Toshiyuki Obata, Toru Nagashima
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Patent number: 9660420Abstract: A laser diode with an improved kink level in the L-I characteristic and capable of obtaining a stable high output in a horizontal transverse mode is provided. The laser diode includes an active layer made of nitride III-V compound semiconductor containing at least gallium (Ga) in 3B-group elements and at least nitrogen (N) in 5B-group elements, an n-type compound semiconductor layer provided on one of faces of the active layer, and a p-type compound semiconductor layer provided on the other face of the active layer. A region closest to the active layer, in the n-type compound semiconductor layer is a high-concentration region whose impurity concentration is higher than that of the other n-type regions.Type: GrantFiled: June 22, 2015Date of Patent: May 23, 2017Assignee: Sony CorporationInventors: Toshiyuki Obata, Hidekazu Kawanishi
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Publication number: 20160254391Abstract: A vertical nitride semiconductor device includes an n-type aluminum nitride single-crystal substrate having an Si content of 3×1017 to 1×1020 cm?3 and a dislocation density of 106 cm?2 or less. An ohmic electrode layer is formed on an N-polarity side of the n-type aluminum nitride single-crystal substrate.Type: ApplicationFiled: October 15, 2014Publication date: September 1, 2016Applicant: TOKUYAMA CORPORATIONInventors: Toru Kinoshita, Toshiyuki Obata, Toru Nagashima
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Publication number: 20160168752Abstract: Provided is a method for pretreatment of a group III nitride single crystal substrate having a high Al composition ratio, for manufacturing a high-quality group III nitride thin film. The method includes heating the base substrate at a temperature range of 1000 to 1250° C. for no less than 5 minutes under a first mixed gas atmosphere before a layer of a second group III nitride single crystal is grown, wherein the first mixed gas includes hydrogen gas and nitrogen gas; the base substrate includes a layer of a first group III nitride single crystal at least on a surface of the base substrate; the first group III nitride single crystal is represented by a composition formula of AlAGaBInCN; and the layer of the second group III nitride single crystal is to be grown on the layer of the first group III nitride single crystal.Type: ApplicationFiled: July 25, 2014Publication date: June 16, 2016Applicant: Tokuyama CorporationInventors: Hiroshi FURUYA, Toshiyuki OBATA
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Publication number: 20160005919Abstract: A nitride semiconductor deep ultraviolet light emitting device having a superior light emission efficiency is provided. A nitride semiconductor light emitting device having emission wavelength of 200 to 300 nm includes an n-type layer consisting of a single layer or a plurality of layers having different band gaps, a p-type layer consisting of a single layer or a plurality of layers having different band gaps, an active layer arranged between the n-type layer and the p-type layer, and an electron blocking layer having a band gap larger than any band gap of layers composing the active layer and the p-type layer. The p-type layer includes a first p-type layer having a band gap larger than a band gap of a first n-type layer which has a smallest band gap in the n-type layer. The electron blocking layer is arranged between the active layer and the first p-type layer.Type: ApplicationFiled: February 2, 2014Publication date: January 7, 2016Inventor: Toshiyuki OBATA
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Publication number: 20150295387Abstract: A laser diode with an improved kink level in the L-I characteristic and capable of obtaining a stable high output in a horizontal transverse mode is provided. The laser diode includes an active layer made of nitride III-V compound semiconductor containing at least gallium (Ga) in 3B-group elements and at least nitrogen (N) in 5B-group elements, an n-type compound semiconductor layer provided on one of faces of the active layer, and a p-type compound semiconductor layer provided on the other face of the active layer. A region closest to the active layer, in the n-type compound semiconductor layer is a high-concentration region whose impurity concentration is higher than that of the other n-type regions.Type: ApplicationFiled: June 22, 2015Publication date: October 15, 2015Inventors: Toshiyuki Obata, Hidekazu Kawanishi
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Patent number: 9112333Abstract: A laser diode with an improved kink level in the L-I characteristic and capable of obtaining a stable high output in a horizontal transverse mode is provided. The laser diode includes an active layer made of nitride III-V compound semiconductor containing at least gallium (Ga) in 3B-group elements and at least nitrogen (N) in 5B-group elements, an n-type compound semiconductor layer provided on one of faces of the active layer, and a p-type compound semiconductor layer provided on the other face of the active layer. A region closest to the active layer, in the n-type compound semiconductor layer is a high-concentration region whose impurity concentration is higher than that of the other n-type regions.Type: GrantFiled: June 13, 2011Date of Patent: August 18, 2015Assignee: Sony CorporationInventors: Toshiyuki Obata, Hidekazu Kawanishi
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Patent number: 8796193Abstract: The first refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one ester additive selected from esters of a monobasic fatty acid having 12 or more carbon atoms and a monohydric alcohol having 1-24 carbon atoms, and an ester of a chain-like dibasic acid and a monohydric alcohol. The second refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one oxygen-containing compound selected from the following (A1)-(A6). The third refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one oxygen-containing compound selected from the following (A1), (A2), (A4), (A7) and (A8).Type: GrantFiled: July 29, 2004Date of Patent: August 5, 2014Assignee: Nippon Oil CorporationInventors: Kazuo Tagawa, Yuji Shimomura, Toshiyuki Obata, Katsuya Takigawa
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Publication number: 20120008657Abstract: A laser diode with an improved kink level in the L-I characteristic and capable of obtaining a stable high output in a horizontal transverse mode is provided. The laser diode includes an active layer made of nitride III-V compound semiconductor containing at least gallium (Ga) in 3B-group elements and at least nitrogen (N) in 5B-group elements, an n-type compound semiconductor layer provided on one of faces of the active layer, and a p-type compound semiconductor layer provided on the other face of the active layer. A region closest to the active layer, in the n-type compound semiconductor layer is a high-concentration region whose impurity concentration is higher than that of the other n-type regions.Type: ApplicationFiled: June 13, 2011Publication date: January 12, 2012Applicant: Sony CorporationInventors: Toshiyuki Obata, Hidekazu Kawanishi
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Patent number: 7970034Abstract: A laser diode device with which a low voltage is realized is provided. The laser diode device includes: a substrate; a semiconductor laminated structure including a first conductive cladding layer, an active layer, and a second conductive cladding layer on one face side of the substrate and having a contact layer as the uppermost layer, in which a protrusion is formed in the contact layer and the second conductive cladding layer; and an electrode provided on the contact layer. The contact layer has a concavo-convex structure on a face on the electrode side, and the electrode is contacted with the contact layer at contact points of a top face, a side face, and a bottom face of the concavo-convex structure.Type: GrantFiled: January 22, 2010Date of Patent: June 28, 2011Assignee: Sony CorporationInventor: Toshiyuki Obata
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Publication number: 20110014626Abstract: Presence of free insulin receptor ?-subunit in blood was discovered. Furthermore, methods for measuring the insulin receptor ?-subunit was provided, the method comprising the steps of contacting the insulin receptor ?-subunit in a blood sample with an antibody recognizing the insulin receptor ?-subunit, and detecting the binding between the two. Measurement of the free insulin receptor ?-subunit in the blood is useful for evaluating risk factors for diabetes. In addition, the measurement methods of the present invention showed that concentrations of the free insulin receptor ?-subunit in the blood of diabetes or cancer patients are significantly high. Free insulin receptor ?-subunit in blood is useful as a marker for diabetes or cancer.Type: ApplicationFiled: April 30, 2010Publication date: January 20, 2011Applicant: Medical and Biological Laboratories Co., Ltd.Inventors: Yousuke Ebina, Toshiyuki Obata, Eiji Okamoto
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Publication number: 20100226403Abstract: A laser diode device with which a low voltage is realized is provided. The laser diode device includes: a substrate; a semiconductor laminated structure including a first conductive cladding layer, an active layer, and a second conductive cladding layer on one face side of the substrate and having a contact layer as the uppermost layer, in which a protrusion is formed in the contact layer and the second conductive cladding layer; and an electrode provided on the contact layer. The contact layer has a concavo-convex structure on a face on the electrode side, and the electrode is contacted with the contact layer at contact points of a top face, a side face, and a bottom face of the concavo-convex structure.Type: ApplicationFiled: January 22, 2010Publication date: September 9, 2010Applicant: Sony CorporationInventor: Toshiyuki Obata
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Patent number: 7732154Abstract: Presence of free insulin receptor ?-subunit in blood was discovered. Furthermore, methods for measuring the insulin receptor ?-subunit was provided, the method comprising the steps of contacting the insulin receptor ?-subunit in a blood sample with an antibody recognizing the insulin receptor ?-subunit, and detecting the binding between the two. Measurement of the free insulin receptor ?-subunit in the blood is useful for evaluating risk factors for diabetes. In addition, the measurement methods of the present invention showed that concentrations of the free insulin receptor ?-subunit in the blood of diabetes or cancer patients are significantly high. Free insulin receptor ?-subunit in blood is useful as a marker for diabetes or cancer.Type: GrantFiled: April 15, 2004Date of Patent: June 8, 2010Assignee: Medical and Biological Laboratories Co., Ltd.Inventors: Yousuke Ebina, Toshiyuki Obata, Eiji Okamoto
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Publication number: 20090316744Abstract: A semiconductor laser including: a nitride III-V compound semiconductor substrate configured to have a first planar area, a second planar area, and a third planar area in a major surface, the first planar area being formed of a C-plane, the second planar area being continuous with the first planar area and being formed of a semipolar plane inclined to the first planar area, the third planar area being continuous with the second planar area and being formed of a C-plane parallel to the first planar area; a first cladding layer configured to be composed of a nitride III-V compound semiconductor on the major surface of the nitride III-V compound semiconductor substrate; an active layer configured to be composed of a nitride III-V compound semiconductor that exists on the first cladding layer and contains In; and a second cladding layer configured to be composed of a nitride III-V compound semiconductor on the active layer.Type: ApplicationFiled: June 18, 2009Publication date: December 24, 2009Applicant: Sony CorporationInventor: Toshiyuki OBATA
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Publication number: 20070155635Abstract: The first refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one ester additive selected from esters of a monobasic fatty acid having 12 or more carbon atoms and a monohydric alcohol having 1-24 carbon atoms, and an ester of a chain-like dibasic acid and a monohydric alcohol. The second refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one oxygen-containing compound selected from the following (A1)-(A6). The third refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one oxygen-containing compound selected from the following (A1), (A2), (A4), (A7) and (A8).Type: ApplicationFiled: July 29, 2004Publication date: July 5, 2007Applicant: NIPPON OIL CORPORATIONInventors: Kazuo Tagawa, Yuji Shimomura, Toshiyuki Obata, Katsuya Takigawa
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Publication number: 20070059784Abstract: Presence of free insulin receptor ?-subunit in blood was discovered. Furthermore, methods for measuring the insulin receptor ?-subunit was provided, the method comprising the steps of contacting the insulin receptor ?-subunit in a blood sample with an antibody recognizing the insulin receptor ?-subunit, and detecting the binding between the two. Measurement of the free insulin receptor ?-subunit in the blood is useful for evaluating risk factors for diabetes. In addition, the measurement methods of the present invention showed that concentrations of the free insulin receptor ?-subunit in the blood of diabetes or cancer patients are significantly high. Free insulin receptor ?-subunit in blood is useful as a marker for diabetes or cancer.Type: ApplicationFiled: April 15, 2004Publication date: March 15, 2007Inventors: Yousuke Ebina, Toshiyuki Obata, Eiji Okamoto