Patents by Inventor Masayasu Yamaguchi
Masayasu Yamaguchi 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: 20240158884Abstract: A clad steel plate having tensile strength (TS) of 780 MPa or more, excellent ductility, bendability, collision resistance, and LME resistance. The clad steel plate having a base metal and a cladding metal on front and back surfaces of the base metal, and the chemical composition and microstructure of the base metal and the cladding metal being appropriately controlled so that the average Vickers hardness (HVL) of the cladding metal is 260 or less, the average Vickers hardness (HVL) of the cladding metal divided by the average Vickers hardness (HVB) of the base metal is 0.80 or less, the boundary roughness between the base metal and the cladding metal is 50 ?m or less at the maximum height Ry, and the number of voids at the boundary between the base metal and the cladding metal is controlled to 20 or fewer per 10 mm length of the boundary.Type: ApplicationFiled: February 28, 2022Publication date: May 16, 2024Applicant: JFE STEEL CORPORATIONInventors: Yoshiyasu KAWASAKI, Yuki TOJI, Tatsuya NAKAGAITO, Shinya YAMAGUCHI, Masayasu UENO, Katsutoshi TAKASHIMA, Tomohiro ONO
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Publication number: 20240150876Abstract: A clad steel plate having tensile strength (TS) of 780 MPa or more, excellent bendability, collision resistance, and LME resistance. The clad steel plate having a base metal and a cladding metal on front and back surfaces of the base metal, and the chemical composition and microstructure of the base metal and the cladding metal being appropriately controlled so that the average Vickers hardness (HVL) of the cladding metal is 260 or less, the average Vickers hardness (HVL) of the cladding metal divided by the average Vickers hardness (HVB) of the base metal is 0.80 or less, the boundary roughness between the base metal and the cladding metal is 50 ?m or less at the maximum height Ry, and the number of voids at the boundary between the base metal and the cladding metal is controlled to 20 or fewer per 10 mm length of the boundary.Type: ApplicationFiled: February 28, 2022Publication date: May 9, 2024Applicant: JFE STEEL CORPORATIONInventors: Yoshiyasu KAWASAKI, Yuki TOJI, Tatsuya NAKAGAITO, Shinya YAMAGUCHI, Masayasu UENO, Katsutoshi TAKASHIMA, Tomohiro ONO
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Patent number: 5648859Abstract: A liquid crystal microprism array has a plurality of grooves formed on a surface of a transparent substrate, a plurality of spaces divided by ridges of the grooves, and a plurality of liquid crystal cells placed in the spaces.Type: GrantFiled: July 27, 1994Date of Patent: July 15, 1997Assignee: Nippon Telephone & Telegraph Corp.Inventors: Katsuhiko Hirabayashi, Tsuyoshi Yamamoto, Masayasu Yamaguchi, Hirofumi Yamazaki
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Patent number: 5217850Abstract: An optical recording disk in which a transfer layer having grooves made of ultraviolet setting resin is laminated on the surface of a substrate, and in which a recording layer is laminated on the transfer layer, the optical recording disk comprises a peeling protrusion projectingly provided on the inner circumferential side of the transfer layer.Type: GrantFiled: November 5, 1991Date of Patent: June 8, 1993Assignee: Pioneer Electronic CorporationInventors: Seiro Fujii, Satoshi Jinno, Takamasa Yoshikawa, Takahiro Kobayashi, Masataka Yamaguchi, Nobuyasu Negishi, Nobuaki Onagi, Shinichiro Suzuki, Masayasu Yamaguchi, deceased, Kiyohide Ogasawara
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Patent number: 5087340Abstract: A magneto-optical recording disk comprises a transparent substrate on which a magneto-optical recording layer made of a rare earth-transition metal alloy having an uniaxial magnetic anisotropy is sandwiched by a pair of dielectric layers is characterized that the dielectric layers are deposited in an amorphous state by means of a low pressure sputtering method.Type: GrantFiled: October 10, 1990Date of Patent: February 11, 1992Assignee: Pioneer Electronic CorporationInventors: Nobuaki Onagi, Shinichiro Suzuki, Seiro Fujii, Takahiro Kobayashi, Takamasa Yoshikawa, Masayasu Yamaguchi, Kiyohide Ogasawara
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Patent number: 4711861Abstract: A sintered aluminum nitride body is produced by adding to aluminum nitride powder at least one sintering aid selected from the borides, carbides, nitrides and fluorides of calcium, strontium, barium and rare earth metals and mixtures thereof in an amount of 0.01 to 10% by weight ofthe aluminum nitride, molding the mixture, and sintering in a non-oxidizing atmosphere.Type: GrantFiled: February 20, 1987Date of Patent: December 8, 1987Assignee: TDK CorporationInventors: Kentaro Sawamura, Yoshio Kosaka, Masayasu Yamaguchi
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Patent number: 4672046Abstract: A sintered aluminum nitride body is produced by adding to aluminum nitride powder at least one sintering aid selected from the nitrides and hydrides of calcium, strontium and barium and mixtures thereof in an amount of 0.01 to 10% by weight of the aluminum nitride, molding the mixture, and sintering in a non-oxidizing atmosphere.Type: GrantFiled: June 17, 1986Date of Patent: June 9, 1987Assignee: TDK CorporationInventors: Kentaro Sawamura, Yoshio Kosaka, Masayasu Yamaguchi
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Patent number: 4650774Abstract: A sintered body comprising on a weight basis, 100 parts of a mixture of 5-40% of titanium carbide and 95-60% alumina, and 0.01 to 5 parts of at least one oxide selected from the group consisting of gallium, barium, calcium, cerium, niobium, and strontium oxides is an improved material for magnetic head sliders. It is prepared by adding the oxide or carbonate of the specific metal to an alumina-titanium carbide mixture and hot press sintering the combined mixture.Type: GrantFiled: December 26, 1985Date of Patent: March 17, 1987Assignee: TDK CorporationInventors: Yukio Kawaguchi, Masayasu Yamaguchi
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Patent number: 4471028Abstract: A honeycomb core diaphragm is described, which contains a honeycomb core made from a thin plate of beryllium or beryllium alloy which is produced by a super-rapid cooling method. Since the thin plate of beryllium or its alloy has a high modulus of elasticity and low density and, furthermore, is easily moldable, it can be easily molded to produce a honeycomb core having a high modulus of elasticity and low density.Type: GrantFiled: May 13, 1982Date of Patent: September 11, 1984Assignee: Pioneer Electronic CorporationInventors: Masami Kimura, Masayasu Yamaguchi
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Patent number: 4072664Abstract: An aromatic polyamide comprising (1) a unit of the formula: ##STR1## and (2) a unit of the formula: ##STR2## and being excellent in strength, rigidity and heat resistance and improved in light resistance, flexibility and wear resistance, which can be produced by polycondensation of a diamine component comprising N,N'-bis(p-aminobenzoyl)-ethylenediamine and p-phenylenediamine, the content of the N,N'-bis (p-aminobenzoyl)ethylenediamine being from about 0.6 to 50 mol %, with a dicarboxylic acid component comprising terephthalic acid or its reactive derivative in a substantially equimolar amount to the diamine component in an amide polar solvent.Type: GrantFiled: February 14, 1975Date of Patent: February 7, 1978Assignee: Toyobo Co., Ltd.Inventors: Tuyoshi Konomi, Seiji Endo, Masayasu Yamaguchi, Kenichi Katsuo
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Patent number: 4011203Abstract: A process for producing novel aromatic polyamides having excellent heat resistance, toughness and chemical resistance and further having improved solubility, molding properties and light resistance, which comprises polycondensing a mixed diamine consisting of piperazine and p-phenylenediamine with a substantially equimolar amount of terephthaloyl dihalide in at least one amide type polar solvent (e.g. hexamethylphosphoramide, N-methyl-2-pyrrolidone, alone or a mixture thereof), wherein said piperazine is contained in a ratio of 10 to 35 % by mol on the basis of the whole mixed diamine component, and fibers produced from the aromatic polyamides having high tenacity, flexing characteristics and wear resistance and further having improved elongation ratio, knot tensile strength, fatigue resistance and fibrillation resistance.Type: GrantFiled: December 19, 1974Date of Patent: March 8, 1977Assignee: Toyobo Co., Ltd.Inventors: Tuyoshi Konomi, Keiji Yukimatsu, Kenichi Katsuo, Masayasu Yamaguchi