Patents by Inventor Tetsuo Masuyama
Tetsuo Masuyama 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: 6860485Abstract: The present invention provides a piston ring comprising a piston ring main body and an expander ring arranged on an inner peripheral surface thereof, the expander ring comprising two oil expander rings, one of which is housed in a space in a spiral of the other. The expander ring is formed so that the pressing force in the diameter expanding direction is larger in a high temperature state than in a low temperature state. The expander comprises two different kinds of expander members. One of these expander members has the same functions as those of a conventional expander, and the other is a member in which there occurs a change in tension in the diametral direction with temperature. As a result, the pressing force of the master expander member having the same effects as those of the conventional expander is made variable.Type: GrantFiled: March 21, 2003Date of Patent: March 1, 2005Assignee: Nippon Piston Ring Co., Ltd.Inventors: Tetsuo Masuyama, Nobuyuki Matsushima
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Publication number: 20030184023Abstract: The present invention provides a piston ring comprising a piston ring main body and an expander ring arranged on an inner peripheral surface thereof, the expander ring comprising two oil expander rings, one of which is housed in a space in a spiral of the other. The expander ring is formed so that the pressing force in the diameter expanding direction is larger in a high temperature state than in a low temperature state. The expander comprises two different kinds of expander members. One of these expander members has the same functions as those of a conventional expander, and the other is a member in which there occurs a change in tension in the diametral direction with temperature. As a result, the pressing force of the master expander member having the same effects as those of the conventional expander is made variable.Type: ApplicationFiled: March 21, 2003Publication date: October 2, 2003Applicant: NIPPON PISTON RING CO., LTD.Inventors: Tetsuo Masuyama, Nobuyuki Matsushima
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Patent number: 6261389Abstract: The present invention provides a synchronizer ring excellent in strength and abrasion resisting property, used in a speed change gear. This synchronizer ring according to the invention is consisted of, by weight, C:0.2˜1.0%, Ni:1.0˜6.0%, Mo:0.6˜3.0%, Cu:1.0˜4.0% and the reminder Fe and inevitable impurities, and is made of Fe sintered alloy of which base composition comprises of mainly martonsite and bainite. And the base composition is preferably consisted of, by volume, martensite: 57˜80%, bainite: 17˜40%, austenite: 8% or less.Type: GrantFiled: April 30, 1998Date of Patent: July 17, 2001Assignee: Nippon Piston Ring Co., Ltd.Inventors: Yoshikatsu Nakamura, Tetsuo Masuyama, Takao Omiya, Hiroshi Takiguchi
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Patent number: 5900559Abstract: In an aspect of the present invention, a synchronizer ring, made of Fe-based sintered alloy, having an internal circumferential surface 101, is provided, the internal circumferential surface 101 being adapted to detachably engage in synchronized sliding with a rotating counterpart member thereof. At least the internal circumferential surface 101 is applied with aqueous vapor treatment to form iron oxide film thereon. In another aspect of the present invention, the iron oxide film has surface roughness not less than 20 .mu.mRz but not more than 55 .mu.mRz. In a further aspect of the present invention, the iron oxide film has a surface roughness not less than 25 .mu.mRz but not more than 35 .mu.mRz. In another aspect of the present invention, the iron oxide film has a thickness not less than 0.05 .mu.m but not more than 5 .mu.m. In a further aspect of the present invention, the major component of the iron oxide film is Fe.sub.3 O.sub.4.Type: GrantFiled: August 29, 1997Date of Patent: May 4, 1999Assignee: Nippon Piston Ring Co., Ltd.Inventors: Yoshikatsu Nakamura, Tetsuo Masuyama
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Patent number: 5861565Abstract: A synchronizer ring performing synchronous sliding operation with and separating operation from a rotating object member, is composed of an Fe sintered alloy. The Fe sintered alloy comprises carbon of from 1.2 wt. % to 2.0 wt. %, copper of from over 15.0 wt. % to 25.0 wt. %, and the balance being iron and incidental impurities. A free Cu phase is precipitated in a matrix of the synchronizer ring. The synchronizer ring has a high scuffing resistance, an excellent friction characteristic, and sufficient abrasion resisting property and strength, and moreover, provides an easy manufacture thereof by means of a size working and is stable in quality.Type: GrantFiled: May 29, 1997Date of Patent: January 19, 1999Assignee: Nippon Piston Ring Co., Ltd.Inventors: Takao Omiya, Kunihiro Iguchi, Tetsuo Masuyama
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Patent number: 5092361Abstract: An inline type check valve having a tubular body, a mushroom or umbrella-shaped piston axially, movably mounted in the tubular body, a coil spring disposed behind the piston in the body, and a hollow disk axially removably fixed to the body. Both the body and the disk made from a synthetic resin reinforced with fibers and resiliently hooked in each other. The piston has its periphery provided with a plurality of grooves to increase the cross-sectional area for fluid flow through the valve.Type: GrantFiled: March 5, 1990Date of Patent: March 3, 1992Assignee: Nippon Piston Ring Co., Ltd.Inventors: Tetsuo Masuyama, Yasuo Suzuki
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Patent number: 4740289Abstract: A process for the hydrogenolysis of a coal liquid bottom containing benzene-insoluble components and having a boiling point of at least 420.degree. C., which comprises:(a) hydrogenating the coal liquid bottom at a temperature of not higher than 350.degree. C. in the presence of a catalyst comprising an alkali metal and/or an alkaline earth metal and a metal of Group VI A of the Periodic Table to reduce the content of the benzene-insoluble components in the fraction having a boiling point of at least 420.degree. C., to a level of not higher than 10% by weight, and then(b) subjecting the product to hydrogenolysis at a temperature of higher than 350.degree. C. and not higher than 450.degree. C. in the presence of a catalyst comprising a metal of Group VI A of the Periodic Table.Type: GrantFiled: April 20, 1987Date of Patent: April 26, 1988Assignees: Mitsubishi Chemical Industries Ltd., Kabushiki Kaisha Kobe Seiko Sho, Idemitsu Kosan Company Limited, Asia Oil Company, Nippon Brown Coal Liquefaction Co., Ltd.Inventors: Yoichi Kageyama, Tetsuo Masuyama
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Patent number: 4556751Abstract: Catalytic isomerization of 10 types of dimethylnaphthalenes, which are classified into four groups, can be carried out by using as a catalyst a zeolite defining the main pore opening consists of a ten-membered oxygen ring.Type: GrantFiled: February 14, 1984Date of Patent: December 3, 1985Assignee: Mitsubishi Chemical Industries LimitedInventors: Takao Maki, Tetsuo Masuyama, Yoshio Asahi
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Patent number: 4478956Abstract: Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.Type: GrantFiled: August 4, 1983Date of Patent: October 23, 1984Assignee: Mitsubishi Chemical Industries LimitedInventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama, Yoshiko Fujiyama
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Patent number: 4423252Abstract: Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.Type: GrantFiled: July 2, 1981Date of Patent: December 27, 1983Assignee: Mitsubishi Chemical Industries LimitedInventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama, Yoshiko Fujiyama
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Patent number: 4405823Abstract: A process for producing phenols from benzenemonocarboxylic acids, or their salts, esters, or anhydrides is described, comprising contacting these starting materials with molecular oxygen-containing gas and steam in a liquid phase in the presence of a copper compound, a manganese compound, and a rare earth element compound. This process can be performed either by a one-step reaction method or by a two-step reaction method. In accordance with the present process, the formation of by-products such as high boiling by-products or diphenyl ethers is inhibited and the selectivity of phenols can be greatly increased.Type: GrantFiled: August 24, 1982Date of Patent: September 20, 1983Assignee: Mitsubishi Chemical Industries LimitedInventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama
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Patent number: 4165441Abstract: A process for producing styrene from 4-vinylcyclohexene by contacting it with molecular oxygen in a gaseous phase and at an elevated temperature in the presence of a catalyst which contains tin, antimony and oxygen.Type: GrantFiled: May 23, 1978Date of Patent: August 21, 1979Assignee: Mitsubishi Chemical Industries, Ltd.Inventors: Takeshi Okano, Tetsuo Masuyama, Toshiharu Yokoyama
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Patent number: 4041082Abstract: In a process for producing an aldehyde by hydroformylation comprising reacting an olefin with carbon monoxide and hydrogen in the presence of a solution of a rhodium-tertiary phosphine complex catalyst and recycling the catalyst-containing solution to the reaction zone after recovering the aldehyde formed by distillation in a distillation zone, the catalyst inactivated by the hydroformylation is reactivated effectively by treating the catalyst-containing solution with carbon dioxide.Type: GrantFiled: July 25, 1975Date of Patent: August 9, 1977Assignee: Mitsubishi Chemical Industries LimitedInventors: Takeru Onoda, Tetsuo Masuyama