Patents by Inventor Akihiro Shishikura
Akihiro Shishikura 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: 11802254Abstract: A grease composition may be used for speed reducers and speed increasers, being excellent in both torque transmission efficiency and leak prevention performance. The grease composition may contain a base oil (A) and a urea-based thickener (B), which is used for speed reducers and speed increasers, wherein the particles containing the urea-based thickener (B) in the grease composition satisfy the following requirement (I). Requirement (I): the area-based arithmetic average particle diameter of the particles is 2.0 ?m or less, as measured by a laser diffraction/scattering method.Type: GrantFiled: February 27, 2020Date of Patent: October 31, 2023Assignee: IDEMITSU KOSAN CO., LTD.Inventor: Akihiro Shishikura
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Patent number: 11746303Abstract: The present invention relates to a grease composition which can impart excellent durability to a bearing used under a high-speed rotation condition with a DN value of 100,000 or more, wherein the grease composition contains a base oil (A) and a urea-based thickener (B), and particles containing the urea-based thickener (B) in the grease composition satisfy requirement (I) that the particles have an arithmetic mean particle diameter of 2.0 ?m or less on an area basis when measured by a laser diffraction scattering method. The grease composition is used for a bearing used under a high-speed rotation condition with a DN value of 100,000 or more.Type: GrantFiled: January 31, 2020Date of Patent: September 5, 2023Assignee: IDEMITSU KOSAN CO., LTD.Inventors: Kouji Takane, Go Watanabe, Akihiro Shishikura, Jun Yamashita
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Patent number: 11555160Abstract: The present invention relates to provision of an extreme pressure agent-containing grease composition using, as a thickener, a urea-based thickener, the grease composition being excellent in both torque transmitting efficiency and leakage prevention performance and also excellent in wear resistance and load resistance. The grease composition contains a base oil (A), a urea-based thickener (B), and an extreme pressure agent (C), wherein particles containing the urea-based thickener (B) in the grease composition satisfies the following requirement (I): Requirement (I): an arithmetic average particle diameter of the particles on an area basis as measured by the laser diffraction/scattering method is 2.0 ?m or less, and the extreme pressure agent (C) is at least one selected from an organic metal-based extreme pressure agent, a sulfur-based extreme pressure agent, a phosphorus-based extreme pressure agent, and a sulfur-phosphorus-based extreme pressure agent.Type: GrantFiled: February 27, 2020Date of Patent: January 17, 2023Assignee: IDEMITSU KOSAN CO., LTD.Inventor: Akihiro Shishikura
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Patent number: 11530365Abstract: The present invention relates to provision of an extreme pressure agent-containing grease composition using, as a thickener, a urea-based thickener, the grease composition being excellent in both torque transmitting efficiency and leakage prevention performance and also excellent in wear resistance and load resistance. The grease composition contains a base oil (A), a urea-based thickener (B), and an extreme pressure agent (C), wherein particles containing the urea-based thickener (B) in the grease composition satisfies the following requirement (I): Requirement (I): an arithmetic average particle diameter of the particles on an area basis as measured by the laser diffraction/scattering method is 2.0 ?m or less, and the extreme pressure agent (C) is at least one selected from an organic metal-based extreme pressure agent, a sulfur-based extreme pressure agent, a phosphorus-based extreme pressure agent, and a sulfur-phosphorus-based extreme pressure agent.Type: GrantFiled: February 27, 2020Date of Patent: December 20, 2022Assignee: IDEMITSU KOSAN CO., LTD.Inventor: Akihiro Shishikura
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Publication number: 20220162513Abstract: A grease composition may be used for speed reducers and speed increasers, being excellent in both torque transmission efficiency and leak prevention performance. The grease composition may contain a base oil (A) and a urea-based thickener (B), which is used for speed reducers and speed increasers, wherein the particles containing the urea-based thickener (B) in the grease composition satisfy the following requirement (I). Requirement (I): the area-based arithmetic average particle diameter of the particles is 2.0 ?m or less, as measured by a laser diffraction/scattering method.Type: ApplicationFiled: February 27, 2020Publication date: May 26, 2022Applicant: IDEMITSU KOSAN CO.,LTD.Inventor: Akihiro SHISHIKURA
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Publication number: 20220135897Abstract: The present invention relates to provision of an extreme pressure agent-containing grease composition using, as a thickener, a urea-based thickener, the grease composition being excellent in both torque transmitting efficiency and leakage prevention performance and also excellent in wear resistance and load resistance. The grease composition contains a base oil (A), a urea-based thickener (B), and an extreme pressure agent (C), wherein particles containing the urea-based thickener (B) in the grease composition satisfies the following requirement (I): Requirement (I): an arithmetic average particle diameter of the particles on an area basis as measured by the laser diffraction/scattering method is 2.0 ?m or less, and the extreme pressure agent (C) is at least one selected from an organic metal-based extreme pressure agent, a sulfur-based extreme pressure agent, a phosphorus-based extreme pressure agent, and a sulfur-phosphorus-based extreme pressure agent.Type: ApplicationFiled: February 27, 2020Publication date: May 5, 2022Applicant: IDEMITSU KOSAN CO.,LTD.Inventor: Akihiro SHISHIKURA
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Publication number: 20220073837Abstract: The present invention relates to a grease composition which can impart excellent durability to a bearing used under a high-speed rotation condition with a DN value of 100,000 or more, wherein the grease composition contains a base oil (A) and a urea-based thickener (B), and particles containing the urea-based thickener (B) in the grease composition satisfy requirement (I) that the particles have an arithmetic mean particle diameter of 2.0 ?m or less on an area basis when measured by a laser diffraction scattering method. The grease composition is used for a bearing used under a high-speed rotation condition with a DN value of 100,000 or more.Type: ApplicationFiled: January 31, 2020Publication date: March 10, 2022Applicant: IDEMITSU KOSAN CO.,LTD.Inventors: Kouji TAKANE, Go WATANABE, Akihiro SHISHIKURA, Jun YAMASHITA
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Publication number: 20210324290Abstract: A grease composition for constant velocity joints can have excellent wear resistance, and may include a base oil (A) and a urea-based thickening agent (B) of formula (B1): R1—NHCONH—R3—NHCONH—R2 (B1), wherein R1 and R2 are independently a monovalent C6 to C24 hydrocarbon group, R1 and R2 optionally differing; and R3 is a divalent C6 to C18 aromatic hydrocarbon group, the monovalent hydrocarbon group containing an alicyclic hydrocarbon group and a hydrocarbon chain, and optionally containing an aromatic hydrocarbon group, wherein, in R1 and R2 of formula (B1), if the content of the alicyclic hydrocarbon group is X molar equivalent, the content of the hydrocarbon chain is Y molar equivalent, and the content of the aromatic hydrocarbon group is Z molar equivalent, (a) and (b) are satisfied: (a): a value of {(X+Y)/(X+Y+Z)}×100 is 90 or more; (b): an X/Y ratio is 10/90 to 75/25.Type: ApplicationFiled: September 12, 2019Publication date: October 21, 2021Applicant: IDEMITSU KOSAN CO.,LTD.Inventors: Asami KOGA, Akihiro SHISHIKURA
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Patent number: 11028335Abstract: Provided is a grease composition which is excellent in fire extinguishing performance without water and can suppress fuming, malodor, and liquefaction on burning and a method for producing the grease composition. A grease composition contains a base oil (A), a thickener (B), and a fire retardant (C), wherein the base oil (A) contains a base oil (A1) having a 40° C. kinematic viscosity of 300 mm2/s or more, a sulfur content of 20 ppm by mass or less, and an initial boiling point of 400° C. or higher, the fire retardant (C) is at least one of aluminum hydroxide (C1) and 1,3,5-triazine-1,3,5 (2H, 4H, 6H)-tris(ethanol) (C2), and a content of the fire retardant (C) is 1.0 to 12.0 mass % based on a total amount of the grease composition.Type: GrantFiled: January 17, 2018Date of Patent: June 8, 2021Assignee: IDEMITSU KOSAN CO., LTD.Inventors: Akihiro Shishikura, Tomonobu Takada, Hiroki Sekiguchi, Asami Koga, Go Watanabe, Harutomo Ikeda
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Patent number: 11021670Abstract: Provided is a mixed grease containing a grease (A) prepared from a base oil (a1) and a thickening agent (a2) that is a lithium soap consisting of a lithium salt of a monovalent fatty acid, and a grease (B) prepared from a base oil (b1) and a thickening agent (b2) that is a lithium complex soap consisting of a lithium salt of a monovalent fatty acid and a lithium salt of a divalent fatty acid. The mixed grease has good wear resistance and load bearing properties and has excellent grease leakage preventing properties.Type: GrantFiled: November 29, 2017Date of Patent: June 1, 2021Assignee: IDEMITSU KOSAN CO., LTD.Inventor: Akihiro Shishikura
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Publication number: 20210095219Abstract: A grease composition containing a base oil (A), a urea-based thickener (B), an antioxidant (C), and a rust inhibitor (D), wherein in a particle size distribution curve obtained by measuring the particle size of particles containing the urea-based thickener (B) in the grease composition on a volume basis with light scattering, a peak indicating the maximum frequency satisfies the following Requirements (I) and (II): (I) a particle size indicating the maximum frequency of the peak is 1.0 ?m or less; and (II) a half width of the peak is 1.0 ?m or less.Type: ApplicationFiled: August 22, 2018Publication date: April 1, 2021Applicant: IDEMITSU KOSAN CO.,LTD.Inventors: Go WATANABE, Akihiro SHISHIKURA, Asami KAGA
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Publication number: 20190300814Abstract: Provided is a grease composition which is excellent in fire extinguishing performance without water and can suppress fuming, malodor, and liquefaction on burning and a method for producing the grease composition. A grease composition contains a base oil (A), a thickener (B), and a fire retardant (C), wherein the base oil (A) contains a base oil (A1) having a 40° C. kinematic viscosity of 300 mm2/s or more, a sulfur content of 20 ppm by mass or less, and an initial boiling point of 400° C. or higher, the fire retardant (C) is at least one of aluminum hydroxide (C1) and 1,3,5-triazine-1,3,5 (2H, 4H, 6H)-tris(ethanol) (C2), and a content of the fire retardant (C) is 1.0 to 12.0 mass % based on a total amount of the grease composition.Type: ApplicationFiled: January 17, 2018Publication date: October 3, 2019Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Akihiro SHISHIKURA, Tomonobu TAKADA, Hiroki SEKIGUCHI, Asami KOGA, Go WATANABE, Harutomo IKEDA
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Publication number: 20190300813Abstract: Provided is a mixed grease containing a grease (A) prepared from a base oil (a1) and a thickening agent (a2) that is a lithium soap consisting of a lithium salt of a monovalent fatty acid, and a grease (B) prepared from a base oil (b1) and a thickening agent (b2) that is a lithium complex soap consisting of a lithium salt of a monovalent fatty acid and a lithium salt of a divalent fatty acid. The mixed grease has good wear resistance and load bearing properties and has excellent grease leakage preventing properties.Type: ApplicationFiled: November 29, 2017Publication date: October 3, 2019Applicant: IDEMITSU KOSAN CO., LTD.Inventor: Akihiro SHISHIKURA
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Publication number: 20170327639Abstract: A method of producing a polycarbonate-polyorganosiloxane copolymer, including: a step (a) of obtaining a solution containing a polycarbonate-polyorganosiloxane copolymer through use of an alkaline aqueous solution of a dihydric phenol, phosgene, a polyorganosiloxane, and an organic solvent; a step (b) of continuously or intermittently draining the solution containing the copolymer from step (a), followed by separation of the drained solution into an aqueous phase and an organic phase to provide the organic phase with copolymer; and a step (c) of concentrating the organic phase with the from step (b) to remove the organic solvent, before heating the organic phase to a boiling region in the step (c), a viscosity of the organic phase being adjusted to 70 cP or less at 35° C., the polycarbonate-polyorganosiloxane copolymer obtained by the steps (a) to (c) including a polycarbonate-polyorganosiloxane copolymer containing a specific polycarbonate block (A) and a specific polyorganosiloxane block (B).Type: ApplicationFiled: December 2, 2015Publication date: November 16, 2017Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Kenji SASAKI, Akihiro SHISHIKURA, Noriyuki KUNISHI, Yukiko NAGAO
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Patent number: 9340743Abstract: A powder metallurgy lubricant includes an aromatic carboxylic acid represented by a formula (1), (Z)n-Ar—COOH??(1) where Ar represents an aryl group and Z represents a substituent directly bonded to the above aryl group and is one of R, OR, OCOR and COOR, R representing one of an alkyl group, alkenyl group and alkynyl group and n being an integer in a range from 1 to 4. Z may be mutually the same or different when n is 2 or larger.Type: GrantFiled: March 3, 2011Date of Patent: May 17, 2016Assignee: IDEMITSU KOSAN CO., LTD.Inventors: Hiroki Sekiguchi, Akihiro Shishikura, Nobuhide Tanino
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Patent number: 9200231Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2); (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.Type: GrantFiled: June 12, 2014Date of Patent: December 1, 2015Assignees: IDEMITSU KOSAN CO., LTD., Nissei Co., Ltd.Inventors: Akihiro Shishikura, Toshinaka Shinbutsu, Shuichi Amano
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Publication number: 20140296116Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2) ; (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.Type: ApplicationFiled: June 12, 2014Publication date: October 2, 2014Applicants: IDEMITSU KOSAN CO., LTD., NISSEI CO., LTD.Inventors: Akihiro SHISHIKURA, Toshinaka SHINBUTSU, Shuichi AMANO
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Patent number: 8835365Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2); (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.Type: GrantFiled: March 25, 2009Date of Patent: September 16, 2014Assignees: Idemitsu Kosan Co., Ltd., Nissei Co., Ltd.Inventors: Akihiro Shishikura, Toshinaka Shinbutsu, Shuichi Amano
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Publication number: 20140144197Abstract: The present invention provides a lubricating oil for rolling, which contains a mineral oil and/or a synthetic oil as the main component and has a friction coefficient of 0.2 or more, and a rolling method using the lubricating oil for rolling.Type: ApplicationFiled: July 25, 2012Publication date: May 29, 2014Applicants: Nissei Co., Ltd., IDEMITSU KOSAN CO., LTD.Inventors: Nobuhide Tanino, Akihiro Shishikura, Toshinaka Shinbutsu, Shuichi Amano, Shoichi Usunami, Shigeru Nagaki, Ryuichi Goto
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Publication number: 20130068069Abstract: A powder metallurgy lubricant includes an aromatic carboxylic acid represented by a formula (1), (Z)n-Ar—COOH ??(1) where Ar represents an aryl group and Z represents a substituent directly bonded to the above aryl group and is one of R, OR, OCOR and COOR, R representing one of an alkyl group, alkenyl group and alkynyl group and n being an integer in a range from 1 to 4. Z may be mutually the same or different when n is 2 or larger.Type: ApplicationFiled: March 3, 2011Publication date: March 21, 2013Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Hiroki Sekiguchi, Akihiro Shishikura, Nobuhide Tanino