Patents by Inventor Masatoshi Kawashima
Masatoshi Kawashima 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: 6084133Abstract: A process for producing a secondary phosphine of formula (2) ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each represent an alkyl group, a cycloalkyl group or an aryl group, each of the above groups being optionally substituted by an alkyl group, an alkoxy group, a halogen atom, a perfluoroalkyl group, an amino group or a phosphino group, which comprises reacting a phosphine halide of formula (1) ##STR2## wherein R.sup.1 and R.sup.2 are as defined above and X represents a halogen atom, with a metal selected from the metals of Groups 2 to 15 in the Periodic Table or an alloy thereof and reacting the resultant metal di-substituted phosphide with an agent for protonation.Type: GrantFiled: September 30, 1999Date of Patent: July 4, 2000Assignee: Kankyo Kagaku Center Co., Ltd.Inventor: Masatoshi Kawashima
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Patent number: 5510520Abstract: The present invention provides three optical resolution methods. The first aspect comprises the steps of adding an optically active bifunctional resolving reagent to a bifunctional compound to form a liquid material, precipitating crystals therefrom, and treating the crystals and the liquid material separately with an acidic material, a basic material, or a basic material and an acidic material, to obtain a pair of enantiomers of an optically active bifunctional compound. The second aspect comprises an optical resolution method by which one necessary enantiomer of a pair of enantiomers in an optically active bifunctional compound is exclusively obtained. The third aspect comprises a method for racemizing one unnecessary enantiomer of a pair of enantiomers in an optically active bifunctional compound which is formed by the optical resolution method of the present invention.Type: GrantFiled: August 19, 1994Date of Patent: April 23, 1996Assignee: Kankyo Kagaku Center Co., Ltd.Inventor: Masatoshi Kawashima
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Patent number: 5420897Abstract: A fast reactor comprises a core composed of nuclear fuel, a core barrel surrounding an outer periphery of the core, an annular reflector surrounding an outer periphery of the core barrel, a partition wall structure surrounding an outer periphery of the annular reflector and supporting the core barrel by a supporting structure arranged radially of the fast reactor, the partition wall structure constituting an inner wall of a coolant passage for a primary coolant, a neutron shield surrounding an outer periphery of the partition wall structure and disposed in the coolant passage, a reactor vessel surrounding an outer periphery of the neutron shield and having an inner wall constituting an outer wall of the coolant passage, and a guard vessel surrounding an outer periphery of the reactor vessel.Type: GrantFiled: July 29, 1993Date of Patent: May 30, 1995Assignees: Kabushiki Kaisha Toshiba, Central Research Institute of Electric Power IndustryInventors: Shigeo Kasai, Masatoshi Kawashima, Tsugio Yokoyama, Katsutada Aoki, Norihiko Handa, Megumu Yoshida, Morihiko Sato, Hiroshi Nakamura, Tohru Iijima, Junko Matsuda, Kenji Ogura, Makoto Ono, Sadao Hattori
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Patent number: 5400375Abstract: In a transuranium elements transmuting reactor core in which a reactor is charged with a plurality of fuel assemblies at a core and an amount of a transuranium element to be added is controlled so as to prevent a fuel element contained in the fuel assemblies from melting, the amount of the transuranium elements to be added to the fuel element is controlled so as to keep an excess reactivity of the reactor substantially zero through an operation of the reactor. A charging density of minor actinides is set to lessen outwards of a core central portion in a core area where a plutonium content is made even. The charging density of minor actinides is set high accordingly in an area where a plutonium is enriched high at the core of a plutonium enriched area where a plutonium content varies.Type: GrantFiled: December 10, 1993Date of Patent: March 21, 1995Assignee: Kabushiki Kaisha ToshibaInventors: Masao Suzuki, Kazuo Arie, Masatoshi Kawashima, Yoshiaki Sato
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Patent number: 5395962Abstract: The present invention provides three optical resolution methods. The first aspect comprises the steps of adding an optically active bifunctional resolving reagent to a bifunctional compound to form a liquid material, precipitating crystals therefrom, and treating the crystals and the liquid material separately with an acidic material, a basic material, or a basic material and an acidic material, to obtain a pair of enantiomers of an optically active bifunctional compound. The second aspect comprises an optical resolution method by which one necessary enantiomer of a pair of enantiomers in an optically active bifunctional compound is exclusively obtained. The third aspect comprises a method for racemizing one unnecessary enantiomer of a pair of enantiomers in an optically active bifunctional compound which is formed by the optical resolution method of the present invention.Type: GrantFiled: November 16, 1992Date of Patent: March 7, 1995Assignee: Kankyo Kagaku Center Co., Ltd.Inventor: Masatoshi Kawashima
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Patent number: 5299241Abstract: In a transuranium elements transmuting reactor core in which a reactor is charged with a plurality of fuel assemblies at a core and an amount of a transuranium element to be added is controlled so as to prevent a fuel element contained in the fuel assemblies from melting, the amount of the transuranium elements to be added to the fuel element is controlled so as to keep an excess reactivity of the reactor substantially zero through an operation of the reactor. A charging density of minor actinides is set to lessen outwards of a core central portion in a core area where a plutonium content is made even. The charging density of minor actinides is set high accordingly in an area where a plutonium is enriched high at the core of a plutonium enriched area where a plutonium content varies.Type: GrantFiled: August 2, 1991Date of Patent: March 29, 1994Assignee: Kabushiki Kaisha ToshibaInventors: Masao Suzuki, Kazuo Arie, Masatoshi Kawashima, Yoshiaki Sato
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Patent number: 5196159Abstract: A fast reactor comprises a reactor vessel to be arranged vertically in a reactor building, a reactor vessel upper structure disposed on an upper portion in the reactor vessel, a drum structure suspended from the reactor vessel structure into a central portion in the reactor vessel so as to define an annular portion between an outer periphery of the drum structure and an inner periphery of the reactor vessel, and a reactor core disposed in the drum structure. A reflector is disposed in the reactor vessel and is vertically movable along an outer periphery of the reactor core. The reflector may be composed of grain materials movable by gravity. An intermediate heat exchanger is further disposed at a portion above the reactor core and an electromagnetic pump is disposed in the reactor vessel for circulating coolant. The reactivity of the reactor core can be controlled by the reflector to thereby reduce the neutron irradiation amount to the reactor vessel.Type: GrantFiled: July 24, 1991Date of Patent: March 23, 1993Assignee: Kabushiki Kaisha ToshibaInventors: Masatoshi Kawashima, Kazumi Miyagi, Masaaki Iida, Katutada Aoki, Norihiko Handa
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Patent number: 5145800Abstract: A method for wiring a power supply for a large-scale integrated circuit. The power supply wires define a power supply grid surrounding lattice openings with fixed longitudinal and transverse lattice dimensions. The wire width is determined based on the integrated circuit chip size, the number of function circuits to be on the integrated circuit, the electrical power requirements of the function circuits, and the fixed longitudinal and transverse lattice dimensions. Longitudinal and transverse locations of the power supply wires chips are determined based on the determined wire width and the fixed longitudinal and transverse dimensions of the lattice openings. Alternatively, the wire width may be fixed and the dimensions of the lattice openings determined based on the integrated circuit chip size, the number of function circuits, the electrical power requirements of the function circuits and that wire width.Type: GrantFiled: July 17, 1991Date of Patent: September 8, 1992Assignee: Hitachi, Ltd.Inventors: Kiyokazu Arai, Masatoshi Kawashima, Akira Yamagiwa, Toshihiro Okabe
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Patent number: 4862068Abstract: A LSI circuit having at least one combinational circuit and a latch coupled to the input side of the combinational circuit. The latch includes a switch for inhibiting the latching of either test data for testing the combinational circuit or data for a normal operation.Type: GrantFiled: July 20, 1987Date of Patent: August 29, 1989Assignee: Hitachi, Ltd.Inventors: Masatoshi Kawashima, Makoto Takechi, Hiroshi Odani
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Patent number: 4792607Abstract: 5-Fluorouracil derivatives of this invention are represented by the general formula: ##STR1## wherein R indicates an alkylene group having 1-8 carbon atoms, A indicates an atomic group of --NH-- and --CO--, n is 0 or 1, and Y indicates an alkyl group having 1-10 carbon atoms, an aryl group, a heteroaryl group, a pyridinium ion having a halogen as a pair ion or an isocyanate group.These derivatives are useful as anticancer medicines and intermediates therefor.These derivatives are produced by six specified methods of this invention. A representative method is a process which comprises reacting 5-fluorouracil and an isocyanate represented by a general formula:Y--(A)n--R--NCO (VII)wherein R, A, n and Y are the same as those indicated in the formula (I).Type: GrantFiled: April 2, 1987Date of Patent: December 20, 1988Assignee: Chisso CorporationInventors: Ryo Yoshizawa, Masatoshi Kawashima, Hitoshi Yano
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Patent number: 4766475Abstract: A semiconductor integrated circuit device which includes input and output buffers having a high versatility of design is disclosed. Each buffer provided in correspondence with a bonding pad is made usable for either the input buffer or the output buffer in accordance with a wiring pattern to be formed therein. With this arrangement, it is possible to use the same circuit elements for both the input buffer and the output buffer. Thus, circuit elements to be exclusively used for inputting and outputting respectively need not be separately formed, and the area occupied by the buffers is reduced to that extent, to realize an increase in the number of pins or a reduction in the size of a chip. In addition, since one buffer can be set for either inputting or outputting, enhancement in the versatility of the design of the pins or the chip is achieved.Type: GrantFiled: December 29, 1986Date of Patent: August 23, 1988Assignee: Hitachi, Ltd.Inventor: Masatoshi Kawashima