Patents by Inventor Masayoshi Oshima
Masayoshi Oshima 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: 20220260142Abstract: A rotary device includes a first rotor and a second rotor. The first rotor includes a first support surface. The first rotor is disposed to be rotatable. The second rotor includes a second support surface radially facing the first support surface to be supported by the first support surface. The second rotor is disposed axially apart from the first rotor. The second rotor is disposed to be rotatable with the first rotor and be rotatable relative to the first rotor.Type: ApplicationFiled: January 12, 2022Publication date: August 18, 2022Inventors: Yusuke TOMITA, Yusuke OKAMACHI, Masayoshi OSHIMA, Yusuke SHIKIJI
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Publication number: 20090220847Abstract: A fuel container for fuel cells includes a container main body obtained by molding a resin material including a cycloolefin polymer resin into a shape which allows the container main body to store fuel, and an outlet provided in the container main body for supplying fuel to a fuel cell. The fuel container does not undergo erosion or swelling caused by a liquid organic compound such as an alcohol, and does not allow leakage of a liquid organic compound.Type: ApplicationFiled: March 3, 2005Publication date: September 3, 2009Applicant: ZEON CORPORATIONInventors: Masayoshi Oshima, Yoshitsugu Hirokawa
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Publication number: 20080285144Abstract: An optical element includes a first liquid, a second liquid, and a container, wherein the first liquid and the second liquid substantially differ in refractive index and are immiscible, the first liquid and the second liquid are hermetically placed in the container so that an interface between the first liquid and the second liquid forms a specific shape, the shape of the interface between the first liquid and the second liquid is changed by applying a voltage between the first liquid and the second liquid through electrodes formed in the container, and the container is (1) a resin container of which an inner surface portion of a container wall has a resin phase with a fluorine atom content higher than that of an internal portion of the container wall, (2) a container of which a top portion and a bottom portion are formed of a resin composition including a resin and a hindered amine compound having a transmittance of light with a wavelength of 400 nm measured for a 5 wt % chloroform solution using a cell withType: ApplicationFiled: December 20, 2005Publication date: November 20, 2008Applicant: ZEON CORPORATIONInventors: Masayoshi Oshima, Tadayuki Kikuma
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Patent number: 6066380Abstract: A molded thermoplastic resin disc substrate specially adapted for use with floating head type recording/reproduction apparatus is provided. The molded disc substrate has surface smoothness characteristics which are the same or better than are provided with mirror polished aluminum discs. The molded disc substrates include a floating head scanning surface wherein the maximum projection height or maximum surface irregularity is less than about 50 nm to reduce or eliminate damage to either the disc or floating head caused by unwanted collisions between them. In a preferred embodiment, the molded disc substrates are molded from a thermoplastic resin composition containing 10000 particles/gram or less of particles having a particle diameter of 0.5 .mu.m or more. In a preferred embodiment, control of particle size and content is achieved by subjecting the resin molding composition to a sequence of filtering steps using filters of decreasing mesh size.Type: GrantFiled: October 13, 1998Date of Patent: May 23, 2000Assignees: Sony Corporation, Nippon Zeon Co., Ltd.Inventors: Eiki Oyanagi, Takeshi Sasa, Yasuyuki Imai, Hiroshi Takino, Teiji Kohara, Masayoshi Oshima
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Patent number: 5585989Abstract: Using a thermoplastic norbornene type plastic as a material for the magnetic disc substrate, a magnetic disc substrate having a small deformation and a high modulus of elasticity is prepared. By optimizing the thickness of the substrate, the resonance frequency of the magnetic disc can be elevated to a level higher than the servo band. As a result, a magnetic disc substrate can form a servo mark having a high positional precision, and can carry out tracking with high precision.Type: GrantFiled: November 23, 1994Date of Patent: December 17, 1996Assignees: Sony Corporation, Nippon Zeon Co., Ltd.Inventors: Miyuki Kuromiya, Hiroshi Takino, Masayoshi Oshima, Teiji Kohara
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Patent number: 5580934Abstract: There are disclosed a polycyclic norbornene or its derivative hydrogenated copolymer which containsa repeating unit represented by the following formula [I] or the alkyl-substituted derivative thereof (A),a repeating unit represented by the following formula [II] or the alkyl-substituted derivative thereof (B) and, as desired,5-85% by mole of at least one repeating unit (C) selected from a repeating unit represented by the following formula [III], the alkyl-substituted derivative thereof, a repeating unit represented by the following formula [IV], the alkyl-substituted derivative and the alkylidene-substituted derivative thereof, and a process for producing the polycyclic norbornene or its derivative ring-opening hydrogenated copolymer ##STR1## wherein ------ represents either a single bond or a double bond.Type: GrantFiled: June 7, 1990Date of Patent: December 3, 1996Assignee: Nippon Zeon Co., Ltd.Inventors: Yoshikatsu Nishi, Masayoshi Oshima, Teiji Kohara, Tadao Natsuume
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Patent number: 5191026Abstract: There are disclosed a polycyclic norbornene or its derivative ring-opening hydrogenated copolymer which contains 90-10% by mole of a repeating unit represented by the following formula [I] or the alkly-substituted derivative, at least a repeating unit represented by the following formula [II] or the alkly-substituted derivative thereof and, as required, a repeating unit represented by the following formula [III], the alkyl-substituted derivative thereof or the alkylidene-substituted derivative thereof, has an intrinsic viscosity [.eta.] of 0.01-20 dl/g as determined in toluene at 25 .degree. C., and in which at least 50% of the (C C) linkages constituting the main chain are single bonds, and the production of said hydrogenation product ##STR1## wherein represents either a single bond or a double bond.Type: GrantFiled: June 7, 1990Date of Patent: March 2, 1993Assignee: Nippon Zeon Co., Ltd.Inventors: Yoshikatsu Nishi, Masayoshi Oshima, Teiji Kohara, Tadao Natsuume
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Patent number: 5143979Abstract: A molding material suitable as an optical material and an optical recording medium formed of the molding material are disclosed. The molding material comprises a hydrogenated product of a polymer formed by ring-opening polymerization of a norbornene-type monomer, the hydrogenated product having a number average molecular weight (Mn) of 20,000 to 50,000, a weight average molecular weight (Mw) of 40,000 to 80,000 and a molecular distribution (Mw/Mn) of not more than 2.5 and having a volatile content of not more than 0.3% by weight.Type: GrantFiled: June 20, 1990Date of Patent: September 1, 1992Assignee: Nippon Zeon Co., LtdInventors: Yoshikatsu Nishi, Masayoshi Oshima, Tadao Natsuume, Teiji Kohara
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Patent number: 5063096Abstract: There is disclosed an optical disk having an optical reflectivity of 70% or above which comprises a substrate made of a thermoplastic saturated norbornene type polymer having a glass transition temperature of 100.degree. C. or above and a light reflecting layer formed by laminating, on said substrate, a multi-layer film constituted of at least one compound selected from the group consisting of metallic oxides and metallic fluorides.Type: GrantFiled: June 7, 1990Date of Patent: November 5, 1991Assignee: Nippon Zeon Co., Ltd.Inventors: Teiji Kohara, Masayoshi Oshima, Tadao Natsuume
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Ring-opened polymer from norbornene type of polycyclic monomer and process for producing the polymer
Patent number: 5061771Abstract: (1) A solvent-soluble ring-opened polymer constituted of 100-50% by weight of a norbornene derivative of monomer (A) represented by the formula ##STR1## wherein, R.sub.1 and R.sub.2 are the same or different and each denote hydrogen or alkyl and m denotes an interger of 0 to 2, and 0-50% by weight of another norbornene derivative of monomer (B) capable of undergoing ring-opening copolymerization with the preceding monomer (A), the polymer having a number average molecular weight of 10,000 to 50,000, a weight average molecular weight-to-number average molecular weight ratio (Mw/Mn) of up to 3, and a glass transition temperature of at least 80.degree. C., and(2) a process for producing such ring-opened polymers as stated above.Type: GrantFiled: November 8, 1989Date of Patent: October 29, 1991Assignee: Nippon Zeon Co., Ltd.Inventors: Masayoshi Oshima, Teiji Kohara, Tohru Hosaka, Tadao Natsuume -
Patent number: 5043395Abstract: There is disclosed an optical material comprising a cyclization product of a conjugated diene polymer having a cyclization ratio of not less than 80% or a hydrogenated product thereof.Type: GrantFiled: November 21, 1989Date of Patent: August 27, 1991Assignee: Nippon Zeon Co., Ltd.Inventors: Masayoshi Oshima, Tadao Natsuume
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Patent number: 5034482Abstract: A process for producing a polymer by ring-opening polymerization of a norbornene-type monomer, which comprises starting the ring-opening polymerization in the presence of a Ziegler-type catalyst consisting essentially of an organometallic compound of a metal belonging to the groups I to III of the periodic table and titanium tetrahalide, carrying out the ring-opening polymerization until the norbornene-type monomer shows a conversion ratio of not less than 60%, and then adding a tungsten and/or molybdenum-based metathesis catalyst to the polymerization reaction system to continue the ring-opening polymerization.Type: GrantFiled: July 18, 1990Date of Patent: July 23, 1991Assignee: Nippon Zeon Co., Ltd.Inventors: Teiji Kohara, Toshihide Murakami, Masayoshi Oshima, Tadao Natsuume