Patents by Inventor Masakuni Hirata
Masakuni Hirata 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: 6627583Abstract: An engine oil composition characterized by containing a major amount of lubricating base oil and (a) 0.01 to 30% by weight of an overbasic oil-soluble metal salt prepared by use of an alkaline-earth metal borate, (b) 0.01 to 5% by weight of a molybdenum dithiocarbamate, and (c) 0.01 to 5% by weight of an antioxidant as essential components, on the basis of the total amount of the composition.Type: GrantFiled: January 30, 2001Date of Patent: September 30, 2003Assignee: Nippon Mitsubishi Oil CorporationInventors: Kiyoshi Inoue, Jinichi Igarashi, Mituaki Ishimaru, Mineo Kagaya, Masakuni Hirata
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Patent number: 6373958Abstract: An electro-mechanical-audio converter and an electro-mechanical-audio converting device using the same employed in mobile terminals such as mobile phones for generating paging vibration which realizes stable vibration function. The electro-mechanical-audio converter includes a housing (1a), movable part (2), forming a magnetic circuit, mounted on an opening of the housing (1a) through a suspension (3); and a detection coil (11) disposed near the movable part (2) for generating excitation voltage by vibration of the movable part (2). Strong vibration of the movable part (2) during resonance is detected by the detection coil (11) as an excitation voltage, and fed back. Accordingly, the electro-mechanical-audio converter and electro-mechanical-audio converting device using the same having an extremely stable vibration function, even when resonance frequency changes due to environmental changes such as ambient temperature, is made feasible.Type: GrantFiled: May 31, 2000Date of Patent: April 16, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mitsutaka Enomoto, Masakuni Hirata, Takanori Fukuyama, Mitsukazu Kuze
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Publication number: 20010044387Abstract: An engine oil composition characterized by containing a major amount of lubricating base oil and (a) 0.01 to 30% by weight of an overbasic oil-soluble metal salt prepared by use of an alkaline-earth metal borate, (b) 0.01 to 5% by weight of a molybdenum dithiocarbamate, and (c) 0.01 to 5% by weight of an antioxidant as essential components, on the basis of the total amount of the composition.Type: ApplicationFiled: January 30, 2001Publication date: November 22, 2001Applicant: Nippon Mitsubishi Oil CorporationInventors: Kiyoshi Inoue, Jinichi Igarashi, Mituaki Ishimaru, Mineo Kagaya, Masakuni Hirata
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Patent number: 5744430Abstract: There is provided a composition having therein a base oil with a specified kinematic viscosity and with a specified total amount of aromatics, comprising, in specified amounts based on the total weight of the composition:(b) an alkaline earth metal salicylate detergent;(c) a zinc dialkyldithiophosphate;(d) a succinimide ashless dispersant containing a polybutenyl group having a specified number-average molecular weight;(e) a phenol ashless antioxidant;(f) a molybdenum dithiocarbamate friction modifier; and(g) a viscosity index improver in such an amount that the kinematic viscosity of said composition ranges from 5.6 to 12.5 mm.sup.2 /s at 100.degree. C. The present invention provides an engine oil which has excellent fuel consumption and maintains the fuel consumption for a long period of time.Type: GrantFiled: April 25, 1996Date of Patent: April 28, 1998Assignee: Nippon Oil Co., Ltd.Inventors: Kiyoshi Inoue, Yasuhisa Yamada, Akira Yaguchi, Masakuni Hirata
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Patent number: 5739088Abstract: An improvement in a method of lubricating an alcohol-based fuel engine with an engine oil composition, the improvement which comprises using as said composition an engine oil composition comprising a lubricating base oil and about 0.01 to 10% by weight based on the total weight of the engine oil composition of an alkaline-earth metal borate. Thus prepared engine oil compositions for alcohol-based fuel engines of the present invention are superior to the prior art compositions in capacity for neutralizing formic acid, wear resistance, and stability against hydrolysis.Type: GrantFiled: July 19, 1994Date of Patent: April 14, 1998Assignee: Nippon Oil Co., Ltd.Inventors: Kiyoshi Inoue, Takashi Mito, Masakuni Hirata
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Patent number: 5701862Abstract: A method and apparatus for replenishing the lubricating oil of an internal combustion engine involving, during operation of the engine, continuously supplying a predetermined quantity of new oil from a reserve tank in which lubricating oil is stored to a holding region for lubricating oil circulated to the engine. As a result, an adequate effective extension of the life of the lubricating oil can be achieved, so that maintenance of the engine lubricating oil can be greatly reduced.Type: GrantFiled: May 16, 1995Date of Patent: December 30, 1997Assignee: Nippon Oil Company LimitedInventors: Kiyoshi Inoue, Masakuni Hirata
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Patent number: 5567342Abstract: An internal combustion engine lubricating oil composition adapted for used with a maintenance-free system of engine and having excellent properties including oxidation stability, resistance against sludge formation and ability to clean the engine. The composition is characterized in that it comprises ingredients (A) through (D) below as essential components on the basis of total amount of composition and the total base number of the composition is between 2.0 and 6.0 mgKOH/g: (A) a specific alkaline earth metal type cleaning agent, (B) zinc dialkyldithiophosphate expressed by a specific general formula (1), (C) a succinic acid imide type ashless dispersant and (D) a phenol type and/or amine type ashless antioxidant.Type: GrantFiled: June 2, 1995Date of Patent: October 22, 1996Assignee: Nippon Oil Co., Ltd.Inventors: Kiyoshi Inoue, Masakuni Hirata
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Patent number: 5372703Abstract: Lubricant base oils are made up essentially of 2-15% by weight of a total aromatics content, greater than 60% by weight of isoparaffins and monocyclic naphthenes in total, more than 30% by weight of alkylbenzenes in the total aromatics content and smaller than 4% by weight of tricyclic and tetracyclic aromatics in the total aromatics content. The base oil has great viscosity index, small pour point, high oxidative stability and heat stability and sufficient capability to dissolve sludge.Type: GrantFiled: April 12, 1993Date of Patent: December 13, 1994Assignee: Nippon Oil Co., Ltd.Inventors: Kouzou Kamiya, Isao Honjo, Toshio Yoshida, Masaru Ushio, Jinichi Igarashi, Masakuni Hirata, Mitsuo Okada, Yuji Ikemoto, Kouichi Oshima, Hiroyuki Takashima
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Patent number: 5281347Abstract: The present invention provides a lubricating composition for internal combustion engines comprising (A) a lubricating base oil in an amount of about 100 parts by weight, and (B) a molybdenum dithiocarbamate in a amount within the range of from about 0.1 to about 3.0 parts by weight, said lubricating base oil consisting substantially of a hydro-cracked lubricating base oil in an amount of more than 70% by weight (on the basis of the amount of the lubricating base oil) wherein the hydro-cracked lubricating base oil is manufactured by hydro-cracking petroleum fraction and has a kinematic viscosity in the range of from about 2 to about 10 cSt at 100.degree. C., said hydro-cracked lubricating base oil containing aromatic hydrocarbons in an amount within the range of from about 3 to about 15% by weight, sulfur in an amount of less than 50 ppm by weight, and nitrogen in an amount of less than 5 ppm by weight on the basis of the amount of the hydro-cracked lubricating base oil.Type: GrantFiled: August 27, 1992Date of Patent: January 25, 1994Assignee: Nippon Oil Co., Ltd.Inventors: Jinichi Igarashi, Masakuni Hirata
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Patent number: 4131658Abstract: A method and apparatus for atomizing oil of high viscosity by a venturi tube, whereby pressurized air is introduced from the outside into a reservoir through said venturi tube, while the oil in the reservoir is transported to the venturi through a conduit, or a suction tube, by the pressure differential between the oil reservoir and the open end of a nozzle and is heated in a heating chamber just before the atomization nozzle which is open into said venturi so as to provide fluidity to the oil.Type: GrantFiled: January 31, 1978Date of Patent: December 26, 1978Assignee: Nippon Oil Company LimitedInventors: Masakuni Hirata, Yukio Matsuzaki
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Patent number: 3946832Abstract: A diaphragm for a loud speaker is manufactured by impregnating a diaphragm blank made of natural or man-made fibers or formed by molding a synthetic resin, with a water-soluble inorganic flame retarder, and thereafter with an aqueous solution of a fluorine containing water repellent and oil repellent agent, and then by heating and molding into a speaker diaphragm.Type: GrantFiled: December 4, 1974Date of Patent: March 30, 1976Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuro Takano, Masakuni Hirata, Yasuo Kodera