Patents by Inventor Yuuichi Murayama
Yuuichi Murayama 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: 10006546Abstract: To provide a piston ring having a hard laminate coating having excellent scuffing resistance, wear resistance and peeling resistance, which can be used in an environment of high mechanical and thermal load in engines, the piston ring is provided on its outer peripheral sliding surface with a CrN-type hard coating as thick as 10-60 ?m and comprising a CrN/CrCN laminate coating having hardness Hv of 1000 or more and residual compression stress of 1500 MPa or less, a laminate unit composed of a CrN layer and a CrCN layer being as thick as 30 nm or more; the CrN/CrCN laminate coating being formed by alternately laminating CrN layers and CrCN layers containing C dissolved in CrN by ion plating.Type: GrantFiled: September 26, 2014Date of Patent: June 26, 2018Assignee: KABUSHIKI KAISHA RIKENInventors: Masayuki Sato, Yuuichi Murayama, Youhei Iwamoto, Takuma Sekiya
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Patent number: 10006547Abstract: To provide a hard-amorphous-carbon-coated piston ring having low friction and excellent wear resistance and peeling resistance to reduce the fuel consumption of automobiles, an outer peripheral surface of a steel-made piston ring base material is provided with a primary layer constituted by a CrN/Cr laminate coating or a CrN/TiN laminate coating as thick as 10-60 ?m, which is obtained by alternately laminating CrN-type chromium nitride and chromium metal or TiN-type titanium nitride, an intermediate layer of chromium metal and/or titanium metal as thick as 0.05-1.0 ?m, and then a hard amorphous carbon coating as thick as 0.4-20 ?m.Type: GrantFiled: October 27, 2014Date of Patent: June 26, 2018Assignee: KABUSHIKI KAISHA RIKENInventors: Masayuki Sato, Yuuichi Murayama, Youhei Iwamoto, Takuma Sekiya
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Patent number: 9447879Abstract: To provide a piston ring having a hard laminate coating for excellent scuffing resistance, wear resistance and peeling resistance, which can be used in an environment of high mechanical and thermal load in engines, the piston ring is provided with a hard laminate coating as thick as 10-60 ?m on its outer peripheral surface, the laminate coating being formed by alternately laminating two types or more of layers made of different compounds, each of the compound layers being made of nitride of at least one metal selected from the group consisting of Ti, Cr, Zr, V, Hf and Al.Type: GrantFiled: December 6, 2013Date of Patent: September 20, 2016Assignee: KABUSHIKI KAISHA RIKENInventors: Masayuki Sato, Yuuichi Murayama, Youhei Iwamoto
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Publication number: 20160238133Abstract: To provide a hard-amorphous-carbon-coated piston ring having low friction and excellent wear resistance and peeling resistance to reduce the fuel consumption of automobiles, an outer peripheral surface of a steel-made piston ring base material is provided with a primary layer constituted by a CrN/Cr laminate coating or a CrN/TiN laminate coating as thick as 10-60 ?m, which is obtained by alternately laminating CrN-type chromium nitride and chromium metal or TiN-type titanium nitride, an intermediate layer of chromium metal and/or titanium metal as thick as 0.05-1.0 ?m, and then a hard amorphous carbon coating as thick as 0.4-20 ?m.Type: ApplicationFiled: October 27, 2014Publication date: August 18, 2016Applicant: KABUSHIKI KAISHA RIKENInventors: Masayuki SATO, Yuuichi MURAYAMA, Youhei IWAMOTO, Takuma SEKIYA
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Publication number: 20160238132Abstract: To provide a piston ring having a hard laminate coating having excellent scuffing resistance, wear resistance and peeling resistance, which can be used in an environment of high mechanical and thermal load in engines, the piston ring is provided on its outer peripheral sliding surface with a CrN-type hard coating as thick as 10-60 ?m and comprising a CrN/CrCN laminate coating having hardness Hv of 1000 or more and residual compression stress of 1500 MPa or less, a laminate unit composed of a CrN layer and a CrCN layer being as thick as 30 nm or more; the CrN/CrCN laminate coating being formed by alternately laminating CrN layers and CrCN layers containing C dissolved in CrN by ion plating.Type: ApplicationFiled: September 26, 2014Publication date: August 18, 2016Applicant: KABUSHIKI KAISHA RIKENInventors: Masayuki SATO, Yuuichi MURAYAMA, Youhei IWAMOTO, Takuma SEKIYA
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Patent number: 9371797Abstract: To provide a high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (220) plane is 1.1-1.8 in X-ray diffraction on the coating surface, larger than those of (111) and (200) planes, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Also, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: GrantFiled: June 21, 2012Date of Patent: June 21, 2016Assignee: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Patent number: 9347559Abstract: A high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines is provided. Also, to provide a piston ring with low friction for contributing to the improvement of fuel efficiency, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (111) plane is 1.2-1.65 in X-ray diffraction on the coating surface, with the texture coefficient of a (111) plane>the texture coefficient of a (220) plane>the texture coefficient of a (200) plane, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Further, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: GrantFiled: June 21, 2012Date of Patent: May 24, 2016Assignee: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Publication number: 20150308573Abstract: To provide a piston ring having a hard laminate coating for excellent scuffing resistance, wear resistance and peeling resistance, which can be used in an environment of high mechanical and thermal load in engines, the piston ring is provided with a hard laminate coating as thick as 10-60 ?m on its outer peripheral surface, the laminate coating being formed by alternately laminating two types or more of layers made of different compounds, each of the compound layers being made of nitride of at least one metal selected from the group consisting of Ti, Cr, Zr, V, Hf and Al.Type: ApplicationFiled: December 6, 2013Publication date: October 29, 2015Applicant: KABUSHIKI KAISHA RIKENInventors: Masayuki SATO, Yuuichi MURAYAMA, Youhei IWAMOTO
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Publication number: 20140137733Abstract: To provide a high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (220) plane is 1.1-1.8 in X-ray diffraction on the coating surface, larger than those of (111) and (200) planes, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Also, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: ApplicationFiled: June 21, 2012Publication date: May 22, 2014Applicant: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Publication number: 20140125013Abstract: A high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines is provided. Also, to provide a piston ring with low friction for contributing to the improvement of fuel efficiency, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (111) plane is 1.2-1.65 in X-ray diffraction on the coating surface, with the texture coefficient of a (111) plane>the texture coefficient of a (220) plane>the texture coefficient of a (200) plane, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Further, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: ApplicationFiled: June 21, 2012Publication date: May 8, 2014Applicant: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Publication number: 20070129438Abstract: A method for suppressing proliferation of abnormal prion proteins is provided. Specifically, the method involves systemically, orally, intracerebrally or intraspinally administering an essential amino acid, in particular, one having a branched side chain, that is, one selected from leucine, isoleucine, and valine. Of these, leucine is most preferred.Type: ApplicationFiled: August 12, 2002Publication date: June 7, 2007Inventors: Yuuichi Murayama, Masami Moriyama