Patents by Inventor Tatsuki NAKAJIMA
Tatsuki NAKAJIMA 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: 20230250354Abstract: One aspect of the present invention is a refrigerating machine oil containing: a base oil; and a partial ester of a carboxylic acid and a polyhydric alcohol, wherein the carboxylic acid contains an unsaturated carboxylic acid.Type: ApplicationFiled: July 7, 2021Publication date: August 10, 2023Applicant: ENEOS CORPORATIONInventors: Tatsuki NAKAJIMA, Shogo HASHIMOTO, Hidetoshi OGATA, Yuma SEKI
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Patent number: 11680220Abstract: The present invention provides a method for producing a refrigerating machine oil, comprising blending a hydrocarbyl hydrogen phosphite having an acid value of 100 mgKOH/g or less with a lubricating base oil or an oil composition containing a lubricating base oil, and a refrigerating machine oil obtained by the method.Type: GrantFiled: January 21, 2020Date of Patent: June 20, 2023Assignee: ENEOS CORPORATIONInventors: Yohei Shono, Tatsuki Nakajima, Shogo Hashimoto, Hidetoshi Ogata
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Publication number: 20230135466Abstract: An aspect of the present invention provides a refrigerating machine oil containing an ester-based base oil, at least one epoxy compound selected from an alkyl glycidyl ether and an aryl glycidyl ether, and a phenol-based antioxidant, wherein a content of the epoxy compound is 0.7% by mass or more based on a total amount of the refrigerating machine oil, and the refrigerating machine oil is used with a refrigerant containing trifluoroiodomethane.Type: ApplicationFiled: March 12, 2021Publication date: May 4, 2023Applicant: ENEOS CORPORATIONInventors: Satoshi NAGAI, Tatsuki NAKAJIMA, Yuya MIZUTANI, Hidetoshi OGATA
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Patent number: 11505760Abstract: The present invention provides a refrigerating machine oil comprising a hydrocarbon-based base oil having a viscosity index of 120 or less, and the refrigerating machine oil being used with a 1-chloro-2,3,3,3-tetrafluoropropene refrigerant.Type: GrantFiled: February 15, 2017Date of Patent: November 22, 2022Assignee: ENEOS CORPORATIONInventors: Yohei Shono, Akira Tada, Yuya Mizutani, Takeshi Okido, Hidetoshi Ogata, Tatsuki Nakajima
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Patent number: 11485926Abstract: The present invention provides a refrigerating machine oil comprising a lubricating base oil and at least one selected from the group consisting of an amine salt of phosphonic acid and an amine salt of phosphonic acid monoester, and a method for producing the same.Type: GrantFiled: January 21, 2020Date of Patent: November 1, 2022Assignee: ENEOS CORPORATIONInventors: Yohei Shono, Tatsuki Nakajima, Shogo Hashimoto, Yuya Mizutani, Hidetoshi Ogata
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Publication number: 20220332996Abstract: A working fluid composition for a refrigerating machine, containing: a refrigerant containing trifluoroiodometbane; and a refrigerating machine oil containing a polyol ester and a hindered phenol compound, wherein a content of the hindered phenol compound is 0.6 to 10% by mass based on a total amount of the refrigerating machine oil.Type: ApplicationFiled: June 17, 2020Publication date: October 20, 2022Applicant: ENEOS CorporationInventors: Satoshi NAGAI, Tatsuki NAKAJIMA, Yuya MIZUTANI, Hidetoshi OGATA
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Publication number: 20220325159Abstract: A working fluid composition for a refrigerating machine, containing: a refrigerant containing trifluoroiodomethane; and a refrigerating machine oil containing a complex ester synthesized from a polyhydric alcohol, a polybasic acid, and at least one selected from a monohydric alcohol and a monocarboxylic fatty acid.Type: ApplicationFiled: June 17, 2020Publication date: October 13, 2022Applicant: ENEOS CorporationInventors: Satoshi NAGAI, Tatsuki NAKAJIMA, Yuya MIZUTANI, Hidetoshi OGATA
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Patent number: 11453839Abstract: The present invention provides a refrigerating machine oil containing a lubricating base oil, a dialkyl hydrogen phosphite having two alkyl groups having 1 to 12 carbon atoms in the molecule, and an epoxy compound.Type: GrantFiled: August 27, 2019Date of Patent: September 27, 2022Assignee: ENEOS CORPORATIONInventors: Yohei Shono, Tatsuki Nakajima, Shogo Hashimoto, Hidetoshi Ogata
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Publication number: 20220267696Abstract: A method for operating a refrigerant circulation system comprising a compressor, a condenser, an expansion mechanism, and an evaporator connected in this order with piping, wherein a refrigerant comprising trifluoroiodomethane is used as a refrigerant; a refrigerating machine oil comprising, as a base oil, a polyolester synthesized from a polyhydric alcohol and fatty acids, with a proportion of a fatty acid having 9 carbon atoms in the fatty acids being 65 mol % or less is used as a refrigerating machine oil; and a temperature of an entire area of the refrigerant circulation system is kept at 160° C. or lower.Type: ApplicationFiled: July 17, 2020Publication date: August 25, 2022Applicant: ENEOS CorporationInventors: Satoshi NAGAI, Tatsuki NAKAJIMA, Yuya MIZUTANI, Hidetoshi OGATA
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Publication number: 20220106538Abstract: One aspect of the present invention is a refrigerating machine oil comprising a base oil, a dithiophosphoric acid ester, and a phosphonate ester.Type: ApplicationFiled: February 19, 2020Publication date: April 7, 2022Applicant: ENEOS CorporationInventors: Yohei SHONO, Tatsuki NAKAJIMA, Shogo HASHIMOTO, Yuya MIZUTANI, Hidetoshi OGATA
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Publication number: 20220098506Abstract: The present invention provides a method for producing a refrigerating machine oil, comprising blending a hydrocarbyl hydrogen phosphite having an acid value of 100 mgKOH/g or less with a lubricating base oil or an oil composition containing a lubricating base oil, and a refrigerating machine oil obtained by the method.Type: ApplicationFiled: January 21, 2020Publication date: March 31, 2022Applicant: ENEOS CorporationInventors: Yohei SHONO, Tatsuki NAKAJIMA, Shogo HASHIMOTO, Hidetoshi OGATA
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Publication number: 20220098507Abstract: The present invention provides a refrigerating machine oil comprising a lubricating base oil and at least one selected from the group consisting of an amine salt of phosphonic acid and an amine salt of phosphonic acid monoester, and a method for producing the same.Type: ApplicationFiled: January 21, 2020Publication date: March 31, 2022Applicant: ENEOS CORPORATIONInventors: Yohei SHONO, Tatsuki NAKAJIMA, Shogo HASHIMOTO, Yuya MIZUTANI, Hidetoshi OGATA
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Publication number: 20220064562Abstract: One aspect of the present invention is a refrigerating machine oil comprising a base oil, a dithiophosphoric acid ester, and an amine salt of an acidic phosphoric acid ester.Type: ApplicationFiled: February 19, 2020Publication date: March 3, 2022Applicant: ENEOS CorporationInventors: Yohei SHONO, Tatsuki NAKAJIMA, Shogo HASHIMOTO, Yuya MIZUTANI, Hidetoshi OGATA
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Patent number: 11208608Abstract: In an aspect, the present invention provides a refrigerating machine oil comprising a poly(meth)acrylate as a base oil, wherein the poly(meth)acrylate comprises a hydrogenated poly(meth)acrylate, a content of a unit having a carbon-carbon double bond present at a terminal in the poly(meth)acrylate is 6% by mole or less relative to total units constituting the poly(meth)acrylate, and a kinematic viscosity at 40° C. of the hydrogenated poly(meth)acrylate is 1 to 1000 mm2/s, the refrigerating machine oil being used with a refrigerant comprising a refrigerant selected from difluoromethane, a mixture of difluoromethane and pentafluoroethane, a mixture of difluoromethane, pentafluoroethane, and 1, 1, 1, 2-tetrafluoroethane, a mixture of pentafluoroethane, 1, 1, 1, 2-tetrafluoroethane, and 1, 1, 1-trifluoroethane, an unsaturated hydrofluorocarbon, a hydrocarbon, and carbon dioxide.Type: GrantFiled: October 20, 2017Date of Patent: December 28, 2021Assignee: ENEOS CORPORATIONInventors: Kentaro Yamaguchi, Akira Tada, Tatsuki Nakajima, Takeshi Okido, Hidetoshi Ogata
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Publication number: 20210324295Abstract: The present invention provides a refrigerating machine oil containing a lubricating base oil, a dialkyl hydrogen phosphite having two alkyl groups having 1 to 12 carbon atoms in the molecule, and an epoxy compound.Type: ApplicationFiled: August 27, 2019Publication date: October 21, 2021Applicant: ENEOS CorporationInventors: Yohei SHONO, Tatsuki NAKAJIMA, Shogo HASHIMOTO, Hidetoshi OGATA
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Publication number: 20210054301Abstract: The present invention provides a refrigerating machine oil comprising a hydrocarbon-based base oil having a viscosity index of 120 or less, and the refrigerating machine oil being used with a 1-chloro-2,3,3,3-tetrafluoropropene refrigerant.Type: ApplicationFiled: February 15, 2017Publication date: February 25, 2021Applicants: JXTG NIPPON OIL & ENERGY CORPORATION, JXTG NIPPON OIL & ENERGY CORPORATIONInventors: Yohei SHONO, Akira TADA, Yuya MIZUTANI, Takeshi OKIDO, Hidetoshi OGATA, Tatsuki NAKAJIMA
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Publication number: 20200199476Abstract: In an aspect, the present invention provides a refrigerating machine oil comprising a poly(meth)acrylate as a base oil, wherein the poly(meth)acrylate comprises a hydrogenated poly(meth)acrylate, a content of a unit having a carbon-carbon double bond present at a terminal in the poly(meth)acrylate is 6% by mole or less relative to total units constituting the poly(meth)acrylate, and a kinematic viscosity at 40° C. of the hydrogenated poly(meth)acrylate is 1 to 1000 mm2/s, the refrigerating machine oil being used with a refrigerant comprising a refrigerant selected from difluoromethane, a mixture of difluoromethane and pentafluoroethane, a mixture of difluoromethane, pentafluoroethane, and 1,1,1,2-tetrafluoroethane, a mixture of pentafluoroethane, 1,1,1,2-tetrafluoroethane, and 1,1,1-trifluoroethane, an unsaturated hydrofluorocarbon, a hydrocarbon, and carbon dioxide.Type: ApplicationFiled: October 20, 2017Publication date: June 25, 2020Applicant: JXTG NIPPON OIL & ENERGY CORPORATIONInventors: Kentaro YAMAGUCHI, Akira TADA, Tatsuki NAKAJIMA, Takeshi OKIDO, Hidetoshi OGATA