Patents by Inventor Keita Akiyama
Keita Akiyama 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: 20240141769Abstract: A mining riser pipe is extended from above water toward a water bottom containing water bottom resources, and a lower portion of an insertion pipe connected to a lower portion of the mining riser pipe is inserted into the water bottom. A liquid is supplied into the insertion pipe and a rotation shaft extends axially inside both of pipes is rotated to rotate stirring blades attached to a lower portion of the rotation shaft inside the insertion pipe, thereby drilling and dissolving mud S inside the insertion pipe into a slurry form is raised to an upper portion of the insertion pipe by a stirring flow generated by the rotation of the stirring blades, and the raised mud is lifted above the water through the mining riser pipe by lifting force.Type: ApplicationFiled: February 8, 2022Publication date: May 2, 2024Inventors: Tomohiro MORISAWA, Shinya OMORI, Ryutaro MURAKAMI, Hiroshi IIDA, Eigo MIYAZAKI, Keita AKIYAMA, Masanori KYO, Ikuo SAWADA, Yoshihisa KAWAMURA
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Publication number: 20240003253Abstract: A mining riser pipe is extended toward a water bottom, and a lower portion of an insertion pipe connected to a lower portion of the mining riser pipe is inserted into the water bottom. A liquid is supplied into the insertion pipe, and a rotation shaft extends inside both pipes and stirring blades attached to a lower portion of the rotation shaft are rotated inside the insertion pipe, thereby drilling and dissolving mud inside the insertion pipe into a slurry. Then, the mud S is raised to an upper portion of the insertion pipe by a stirring flow generated by the stirring blades, and the raised mud slurry is lifted above the water through the mining riser pipe 2, and a rotation speed of the stirring blades is lower in an initial process at an early stage of the drilling than in a subsequent process.Type: ApplicationFiled: February 8, 2022Publication date: January 4, 2024Inventors: Tomohiro MORISAWA, Shinya OMORI, Yosuke TANAKA, Eigo MIYAZAKI, Keita AKIYAMA, Masanori KYO, Ikuo SAWADA, Yoshihisa KAWAMURA
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Publication number: 20230112110Abstract: A method for recovering rare-earth mud including steps of: (A) penetrating a mud gathering pipe into a layer containing rare-earth mud under the seafloor, (B) preparing a slurry containing a rare earth by loosening rare-earth mud in the mud gathering pipe, and (C) transferring the slurry through a mud raising pipe. A rare-earth mud recovery system including: a mud gathering pipe configured to penetrate into a layer containing rare-earth mud under a seafloor; a stirring device configured to loosen rare-earth mud in the mud gathering pipe; and a mud raising pipe connected to the mud gathering pipe.Type: ApplicationFiled: February 26, 2021Publication date: April 13, 2023Applicant: Japan Agency for Marine-Earth Science and TechnologyInventors: Eigou MIYAZAKI, Yoshihisa KAWAMURA, Ikuo SAWADA, Masanori KYO, Mikito FURUICHI, Keita AKIYAMA, Yasuhiro NAMBA
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Publication number: 20220236556Abstract: A light deflector includes a mirror part, a pair of torsion bars, inside piezoelectric actuators, and a movable frame part. The crystal orientation in the axial direction of the torsion bars is set to <100>. In the joint edge portions of the torsion bars and the inside piezoelectric actuators, radius parts are oriented to <110> and each formed by a curved surface recessed inward. The amount of waviness about a roughness curve derived from the curved surface is set within 600 nm.Type: ApplicationFiled: May 20, 2020Publication date: July 28, 2022Applicant: STANLEY ELECTRIC CO., LTD.Inventor: Keita AKIYAMA
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Patent number: 10767446Abstract: A concave section such as an extension section, a cutting section, and a notch section is provided to receive a lid of a float valve in an inside of outer tube assembly of a drill string. Thus, when the float valve is provided for the drill string, it is made possible to collect a core with a larger diameter by a thinner drill string, by expanding the inner diameter of the drill string.Type: GrantFiled: July 21, 2016Date of Patent: September 8, 2020Assignees: JAPAN AGENCY FOR MARINE-EARTH SCIENCE AND TECHNOLOGY, NLC CO., LTD.Inventors: Yuichi Shimmoto, Eigou Miyazaki, Keita Akiyama, Masaki Kawahara, Tomoaki Suzuki
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Publication number: 20180209245Abstract: A concave section such as an extension section, a cutting section, and a notch section is provided to receive a lid of a float valve in an inside of outer tube assembly of a drill string. Thus, when the float valve is provided for the drill string, it is made possible to collect a core with a larger diameter by a thinner drill string, by expanding the inner diameter of the drill string.Type: ApplicationFiled: July 21, 2016Publication date: July 26, 2018Applicants: JAPAN AGENCY FOR MARINE-EARTH SCIENCE AND TECHNOLOGY, NLC CO., LTD.Inventors: Yuichi SHIMMOTO, Eigou MIYAZAKI, Keita AKIYAMA, Masaki KAWAHARA, Tomoaki SUZUKI
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Patent number: 8610151Abstract: There is provided a light-emitting element having a semiconductor film which includes a p-type current-spreading layer of GaInP or GaP; a first p-clad of AlInP; a second p-clad of AlGaInP; an active layer including of GaInP or AlGaInP; a first n-clad having a carrier density of 1×1018 cm?3 to 5×1018 cm?3; a second n-clad having a carrier density of 1×1018 cm?3 to 5×1018 cm?3; wherein the thickness proportion of the first p-clad in an entire p-clad, is 50% to 80%; the thickness of an entire n-clad is equal to or greater than 2 ?m; the thickness proportion of the first n-clad in the entire n-clad is equal to or greater than 80%; and the thickness of the second n-clad is equal to or greater than 100 nm.Type: GrantFiled: March 8, 2012Date of Patent: December 17, 2013Assignee: Stanley Electric Co., Ltd.Inventors: Chiharu Sasaki, Wataru Tamura, Keita Akiyama
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Patent number: 8507943Abstract: A semiconductor light-emitting element with a counter electrode structure can include a first electrode including at least one linear first electrode piece that is disposed on a surface of a first semiconductor layer close to the support substrate and in ohmic contact with the first semiconductor layer, a second electrode including at least one linear second electrode piece that is disposed on a surface of a second semiconductor layer and in ohmic contact with the second semiconductor layer. A plurality of conical projections can be formed on the second semiconductor layer. The first electrode piece and the second electrode piece can be disposed soas not to overlap with each other in a stacked direction of the semiconductor light-emitting stacked body but to be parallel with each other when viewed from above.Type: GrantFiled: March 26, 2012Date of Patent: August 13, 2013Assignee: Stanley Electric Co., Ltd.Inventors: Keita Akiyama, Takuya Kazama
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Patent number: 8367449Abstract: A semiconductor light-emitting apparatus that has high luminous efficiency and a high breakdown voltage as well as reduced breakdown voltage variation among lots. The semiconductor light-emitting apparatus includes a first clad layer and a second clad layer. An average dopant concentration of the second clad layer is lower than that of the first clad layer. The light-emitting apparatus also includes an active layer having an average dopant concentration of 2×1016 to 4×1016 cm?3. The active layer is made of (AlyGa1-y)xIn1-xP (0<x?1, 0?y?1). The light-emitting apparatus also includes a third clad layer, and a second-conducting-type semiconductor layer made of Ga1-xInxP (0?x<1). If d is the layer thickness of the second clad layer (nm) and Nd1 is the average dopant concentration of the second clad layer (cm?3), then d?1.2×Nd1×10?15+150 is satisfied.Type: GrantFiled: February 14, 2011Date of Patent: February 5, 2013Assignee: Stanley Electric Co., Ltd.Inventors: Chiharu Sasaki, Wataru Tamura, Keita Akiyama
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Publication number: 20120241808Abstract: A semiconductor light-emitting element with a counter electrode structure can include a first electrode including at least one linear first electrode piece that is disposed on a surface of a first semiconductor layer close to the support substrate and in ohmic contact with the first semiconductor layer, a second electrode including at least one linear second electrode piece that is disposed on a surface of a second semiconductor layer and in ohmic contact with the second semiconductor layer. A plurality of conical projections can be formed on the second semiconductor layer. The first electrode piece and the second electrode piece can be disposed so as not to overlap with each other in a stacked direction of the semiconductor light-emitting stacked body but to be parallel with each other when viewed from above.Type: ApplicationFiled: March 26, 2012Publication date: September 27, 2012Inventors: Keita Akiyama, Takuya Kazama
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Publication number: 20120228658Abstract: There is provided a light-emitting element having a semiconductor film which includes a p-type current-spreading layer of GaInP or GaP; a first p-clad of AlInP; a second p-clad of AlGaInP; an active layer including of GaInP or AlGaInP; a first n-clad having a carrier density of 1×1018 cm?3 to 5×1018 cm?3; a second n-clad having a carrier density of 1×1018 cm?3 to 5×1018 cm?3; wherein the thickness proportion of the first p-clad in an entire p-clad, is 50% to 80%; the thickness of an entire n-clad is equal to or greater than 2 ?m; the thickness proportion of the first n-clad in the entire n-clad is equal to or greater than 80%; and the thickness of the second n-clad is equal to or greater than 100 nm.Type: ApplicationFiled: March 8, 2012Publication date: September 13, 2012Applicant: STANLEY ELECTRIC CO., LTD.Inventors: Chiharu SASAKI, Wataru TAMURA, Keita AKIYAMA
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Publication number: 20110198634Abstract: A semiconductor light-emitting apparatus that has high luminous efficiency and a high breakdown voltage as well as reduced breakdown voltage variation among lots. The semiconductor light-emitting apparatus includes a first clad layer and a second clad layer. An average dopant concentration of the second clad layer is lower than that of the first clad layer. The light-emitting apparatus also includes an active layer having an average dopant concentration of 2×1016 to 4×1016 cm?3. The active layer is made of (AlyGa1-y)xIn1-xP (0<x?1, 0?y?1). The light-emitting apparatus also includes a third clad layer, and a second-conducting-type semiconductor layer made of Ga1-xInxP (0?x<1). If d is the layer thickness of the second clad layer (nm) and Nd1 is the average dopant concentration of the second clad layer (cm?3), then d?1.2×Nd1×10?15+150 is satisfied.Type: ApplicationFiled: February 14, 2011Publication date: August 18, 2011Applicant: STANLEY ELECTRIC CO., LTD.Inventors: Chiharu SASAKI, Wataru Tamura, Keita Akiyama
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Patent number: D727085Type: GrantFiled: November 12, 2013Date of Patent: April 21, 2015Assignee: Zojirushi CorporationInventors: Keito Kotani, Keita Akiyama
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Patent number: D765460Type: GrantFiled: May 7, 2015Date of Patent: September 6, 2016Assignee: Zojirushi CorporationInventor: Keita Akiyama
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Patent number: D799963Type: GrantFiled: May 17, 2016Date of Patent: October 17, 2017Assignee: ZOJIRUSHI CORPORATIONInventor: Keita Akiyama