Patents by Inventor Eizo Naya
Eizo Naya 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: 5225381Abstract: A vacuum switch contact material consists essentially of a mixture of Cu and Cr.sub.x O.sub.y (x=1 to 2, y=0 to 3) wherein Cr.sub.x O.sub.y is in a particulate state, the center part of the particles consists of Cr.sub.2 O.sub.3 (x=2, y=3), and the peripheral part of the particles consists of Cr (x=1, y=0). The Cr.sub.x O.sub.y particles having Cr.sub.2 O.sub.3 central part and Cr periphery can be formed by reducing the surface of Cr.sub.2 O.sub.3 particles. Cu may be infiltrated into the open pores of Cr.sub.x O.sub.y particles after a green compact of Cr.sub.2 O.sub.3 is formed. Alternatively, a mixture of Cr.sub.2 O.sub.y particles and Cu particles may be formed into a green compact, which may then be sintered. Still alternatively, a mixture of Cr.sub.2 O.sub.y particles and Cu particles may be hot-pressed.Type: GrantFiled: April 27, 1992Date of Patent: July 6, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura
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Patent number: 5130068Abstract: A vacuum switch contact material consists essentially of a mixture of Cu and Cr.sub.x O.sub.y (x=1 to 2, y=0 to 3) wherein Cr.sub.x O.sub.y is in a particulate state, the center part of the particles consists of Cr.sub.2 O.sub.3 (x=2, y=3), and the peripheral part of the particles consists of Cr (x=1, y=0). The Cr.sub.x O.sub.y particles having Cr.sub.2 O.sub.3 central part and Cr periphery can be formed by reducing the surface of Cr.sub.2 O.sub.3 particles. Cu may be infiltrated into the open pores of Cr.sub.x O.sub.y particles after a green compact of Cr.sub.2 O.sub.3 is formed. Alternatively, a mixture of Cr.sub.2 O.sub.y particles and Cu particles may be formed into a green compact, which may then be sintered. Still alternatively, a mixture of Cr.sub.2 O.sub.y particles and Cu particles may be hot-pressed.Type: GrantFiled: October 4, 1990Date of Patent: July 14, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura
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Patent number: 5019156Abstract: A sintered electric contact material for use in vacuum switch tubes comprises about 50 to 70% by volume of a Cr powder, about 0.1 to 1.15% by volume of a Ti powder, and the remainder of a Cu powder. The sintered material can be obtained advantageously by heating a mixture of the Cr powder, the Ti powder and the Cu powder in a non-oxidizing atmosphere under pressure, at a temperature below the melting point of Cu (the melting point is 1083.degree. C. at normal pressure).Type: GrantFiled: May 17, 1990Date of Patent: May 28, 1991Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura
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Patent number: 4971866Abstract: In manufacturing contact materials which satisfy all the criteria required for use in vacuum switches as to chopping current, circuit breaking performance, withstanding voltage, welding separation force and wear, Cu powder and Ta.sub.2 O.sub.5 powder are mixed, and compressed while heating below the melting point of Cu in a nonoxidizing atmosphere. Alternatively a green compact is first manufactured from Ta.sub.2 O.sub.5 powder or a mixture of Ta.sub.2 O.sub.5 and Cu powder, and molten Cu is made to infiltrate into the compact. Preparing a green compact from a mixture of Cu powder and Ta.sub.2 O.sub.5 powder, it may be sintered at a temperature below the melting point of Cu, re-pressed, and resintered at 400.degree.-900.degree. C. in a nonoxidizing atmosphere.Type: GrantFiled: January 8, 1990Date of Patent: November 20, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura
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Patent number: 4927989Abstract: A contact material for a vacuum circuit breaker having excellent properties, which consists essentially of copper, molybdenum, one member selected from the group consisting of niobium and tantalum, and one or more kinds of low melting point materials.Type: GrantFiled: April 11, 1989Date of Patent: May 22, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura, Seiichi Miyamoto
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Patent number: 4926017Abstract: A pair of electrodes connected to conductors through joining means respectively are arranged in a vacuum switch tube such that current passes when they come into contact, and does not pass when they separate. At least part of the electrodes, the conductors or the joining means is made of materials with vibration absorbing properties.Type: GrantFiled: March 24, 1988Date of Patent: May 15, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shinichi Aoki, Eizo Naya
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Patent number: 4870231Abstract: A contact for a vacuum interrupter, of a material containing copper (Cu), chromium (Cr), molybdenum (Mo), and either tantalum (Ta) or niobium (Nb), has splendid interrupting ability and breakdown voltage ability.Type: GrantFiled: July 27, 1987Date of Patent: September 26, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura
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Patent number: 4827289Abstract: A thermal head for a printer in accordance with the present invention comprises: a substrate (11); a heater layer (12) on the substrate; lead wires (13a and 13b) formed on the heater layer for supplying electric power to the heater layer; and a single protective layer (20) for protecting the heater layer and the lead wires by covering them, the protective layer including an oxide or a nitride.Type: GrantFiled: June 23, 1988Date of Patent: May 2, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shiro Tsuji, Eizo Naya, Takashi Yamanaka, Yoshihiro Usui, Hiroshi Ito, Noriyuki Hasebe
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Patent number: 4784829Abstract: A contact material for a vacuum circuit breaker of excellent current breaking property and voltage withstand capability can be made from an alloy composed of copper and boride of tantalum, or an alloy composed of copper, boride of tantalum and titanium, or an alloy composed of copper, chromium, and boride of tantalum.Type: GrantFiled: April 29, 1986Date of Patent: November 15, 1988Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Mitsuhiro Okumura, Eizo Naya
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Patent number: 4677264Abstract: The present invention provides a contact material for a vacuum circuit breaker containing therein copper (Cu) and chromium (Cr) with further addition of at least one kind of boride selected from borides of chromium (Cr), molybdenum (Mo) and tungsten (W). Such contact material possesses remarkable advantages of having large current breaking capability and high voltage withstand capability.Type: GrantFiled: December 5, 1985Date of Patent: June 30, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Mitsuhiro Okumura, Eizo Naya, Mitsuhiro Harima, Shoji Murakami, Seiichi Miyamoto
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Patent number: 4626282Abstract: Contact material for vacuum circuit breaker according to the present invention contains (1) copper, (2) molybdenum, and (3) niobium or tantalum.Type: GrantFiled: October 30, 1985Date of Patent: December 2, 1986Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura
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Patent number: 4575451Abstract: A contact material for a vacuum circuit breaker consists essentially of copper as the basic component, and, as the other components, 35% by weight or below of chromium and 50% by weight or below of niobium, the total quantity of chromium and niobium in said contact material being 10% by weight and above.Type: GrantFiled: November 16, 1983Date of Patent: March 11, 1986Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Mitsuhiro Okumura
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Patent number: 4540861Abstract: A contact material for use in a vacuum circuit interrupter which simultaneously provides superior current interrupting performance and breakdown voltage. The contact material of the invention includes components of copper, tantalum and at least one of cobalt and iron. Cobalt or iron should be present in an amount of 50 wt % or less, while the combination of tantalum and cobalt or iron should be present in an amount of at least 10 wt %. A fourth component of at least one of titanium, zirconium and aluminum may be added. Also, there may be included a fifth component containing at least one of a low melting point metal, alloys of a low melting point metal, intermetallic compounds of a low melting point metal, and oxides thereof, with the low melting point metal being at least one of bismuth, tellurium, antimony, thallium, lead, selenium, cerium and calcium in an amount of not more than 20 wt %.Type: GrantFiled: April 12, 1984Date of Patent: September 10, 1985Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Mitsuhiro Okumura, Eizo Naya, Mitsumasa Yorita, Yasushi Takeya
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Patent number: 4537743Abstract: The disclosed electrode composition for a vacuum switch comprises copper, as a principal ingredient, a low melting point metal such as Bi, Pb, In, Li, Sn or any of their alloys, in a content not exceeding 20% by weight, a first additional metal such as Te, Sb, La, Mg or any of their alloys and a refractory metal such as Cr, Fe, Co, Ni, Ti, W or any of their alloys in a content less than 40% by weight.Type: GrantFiled: June 25, 1984Date of Patent: August 27, 1985Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Yamanaka, Yasushi Takeya, Mitsumasa Yorita, Toshiaki Horiuchi, Kouichi Inagaki, Eizo Naya, Michinosuke Demizu, Mitsuhiro Okumura
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Patent number: 4517033Abstract: A contact material for a vacuum circuit breaker consists essentially of copper as the basic component, and, as the other components, 35% by weight or below of chromium and 50% by weight or below of tantalum, the total quantity of chromium and tantalum in said contact material being 10% by weight and above.Type: GrantFiled: October 31, 1983Date of Patent: May 14, 1985Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Mitsuhiro Okumura, Eizo Naya, Michinosuke Demizu
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Patent number: 4499009Abstract: The disclosed electrode composition for a vacuum switch comprises copper, as a principal ingredient, a low melting point metal such as Bi, Pb, In, Li, Sn or any of their alloys, in a content not exceeding 20% by weight, a first additional metal such as Te, Sb, La, Mg or any of their alloys and a refractory metal such as Cr, Fe, Co, Ni, Ti, W or any of their alloys in a content less than 40% by weight.Type: GrantFiled: December 20, 1982Date of Patent: February 12, 1985Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Yamanaka, Yasushi Takeya, Mitsumasa Yorita, Toshiaki Horiuchi, Kouichi Inagaki, Eizo Naya, Michinosuke Demizu, Mitsuhiro Okumura
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Patent number: 4486631Abstract: A contact for a vacuum circuit breaker is disclosed which contains copper as a first component and also at least two elements of the group of chromium, molybdenum, and tungsten as the other components. Each of these other components is contained in an amount not greater than 40% by weight.Type: GrantFiled: December 22, 1982Date of Patent: December 4, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eizo Naya, Toshiaki Horiuchi, Yasushi Takeya, Kouichi Inagaki, Michinosuke Demizu, Mitsuhiro Okumura
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Patent number: 4424429Abstract: A contactor for a vacuum type circuit interrupter having a pair of detachable electrodes in a vacuum chamber comprises an electrode obtained by melting or sintering a composition of an electric conductive metal of copper or silver as a main component and at least one metal oxide having a melting point lower than that of said conductive metal of bismuth oxide, thallium oxide, indium oxide, antimony oxide or tellurium oxide as an additive, in vacuum or a reduced atmosphere or a nonoxidative atmosphere.Type: GrantFiled: December 30, 1981Date of Patent: January 3, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Yamanaka, Kouichi Inagaki, Eizo Naya, Michinosuke Demizu, Mitsuhiro Okumura