Patents by Inventor Masao Fukutomi
Masao Fukutomi 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: 7132388Abstract: The present invention provides a high-temperature oxide superconductors, which comprises an oxide expressed as (Bi1-xAx)—B—C—Cu oxide (where, A is Sb and/or AS; B and C are elements different from each other, each being one or more elements selected from the group consisting of Be, Mg, Ca, Sr and Ba; and x is characterized by 0?x?1). According to the present invention, it is possible to manufacture a high-temperature oxide superconductor having a transition temperature of over 100 K and not containg a rare-earth element at all, and to manufacture an excellent superconductor in reliability and stability easilier than doing conventional superconductors such as Y—Ba type ones.Type: GrantFiled: January 4, 1989Date of Patent: November 7, 2006Assignee: National Research Institute for MetalsInventors: Hiroshi Maeda, Yoshiaki Tanaka, Masao Fukutomi, Toshihisa Asano
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Patent number: 6271473Abstract: A clad superconductive wire or tape of an oxide superconductive material and a silver-copper alloy base containing 0.05-90 atomic % a copper or a silver alloy. The silver-copper alloy base contains one or more elements selected from the group of Zr, Hf, Al, V, Nb and Ta in amounts of from 0.01-3 atomic %, or contains Au in amount of 0.01-10 atomic %. The silver alloy contains one or more elements selected from the group of Ti, Zr, Hf, V, Nb, Ta, Mg, Ca, Sr and Ba in amounts of from 0.01 to 3 atomic %, or one or more elements selected from the group of Au, Al, Ga, In and Sn in amounts of 0.05 to atomic %. The base material is filled with a Bi-containing oxide of Bi1PbuSrxCayCuzOw wherein u=0-0.3, X=0.8-1.2, y=0.2-1.2, and z=0.8-2.0, and processed to obtain a superconductive wire or tape having enhanced mechanical strength, superconductivity and plastic workability.Type: GrantFiled: May 15, 1997Date of Patent: August 7, 2001Assignees: Sumitomo Heavy Industries Ltd., National Research Institute for MetalsInventors: Yoshiaki Tanaka, Tomoyuki Yanagiya, Fumiaki Matsumoto, Masao Fukutomi, Toshihisa Asano, Kazunori Komori, Hiroshi Maeda
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Patent number: 6246007Abstract: A clad superconductive wire or tape of an oxide superconductive material and a silver-copper alloy base containing 0.05-90 atomic % copper or a silver alloy. The silver-copper alloy base contains one or more elements selected from the group of Zr, Hf, Al, V, Nb and Ta in amounts of from 0.01-3 atomic %, or contains Au in amount of 0.01-10 atomic %. The silver alloy contains one or more elements selected from the group of Ti, Zr, Hf, V, Nb, Ta, Mg, Ca, Sr and Ba in amounts of from 0.01 to 3 atomic %, or one or more elements selected from the group of Au, Al, Ga, In and Sn in amounts of 0.05 to atomic %. The base material is filled with a Bi-containing oxide of Bi1PbuSrxCayCuzOw wherein u=0-0.3, X=0.8-1.2, y=0.2-1.2, and z=0.8-2.0, and processed to obtain a superconductive wire or tape having enhanced mechanical strength, superconductivity and plastic workability.Type: GrantFiled: May 15, 1997Date of Patent: June 12, 2001Assignees: Sumitomo Heavy Industries, Ltd., National Research Institute for MetalsInventors: Yoshiaki Tanaka, Tomoyuki Yanagiya, Fumiaki Matsumoto, Masao Fukutomi, Toshihisa Asano, Kazunori Komori, Hiroshi Maeda
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Patent number: 5827801Abstract: A clad superconductive wire or tape of an oxide superconductive material and a silver-copper alloy base containing 0.05-90 atomic % copper or a silver alloy. The silver-copper alloy base contains one or more elements selected from the group of Zr, Hf, Al, V, Nb and Ta in amounts of from 0.01-3 atomic %, or contains Au in amount of 0.01-10 atomic %. The silver alloy contains one or more elements selected from the group of Ti, Zr, Hf, V, Nb, Ta, Mg, Ca, Sr and Ba in amounts of from 0.01 to 3 atomic %, or one or more elements selected from the group of Au, Al, Ga, In and Sn in amounts of 0.05 to atomic %. The base material is filled with a Bi-containing oxide of Bi.sub.1 Pb.sub.u Sr.sub.x Ca.sub.y Cu.sub.z O.sub.w wherein u=0-0.3, x=0.8-1.2, y=0.2-1.2, and z=0.8-2.0, and processed to obtain a superconductive wire or tape having enhanced mechanical strength, superconductivity and plastic workability.Type: GrantFiled: May 15, 1997Date of Patent: October 27, 1998Assignees: Sumitomo Heavy Industries, Ltd., National Research Institute for MetalsInventors: Yoshiaki Tanaka, Tomoyuki Yanagiya, Fumiaki Matsumoto, Masao Fukutomi, Toshihisa Asano, Kazunori Komori, Hiroshi Maeda
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Patent number: 5663528Abstract: A clad superconductive wire or tape of an oxide superconductive material and a silver-copper alloy base containing 0.05-90 atomic % copper or a silver alloy. The silver-copper alloy base contains one or more elements selected from the group of Zr, Hf, Al, V, Nb and Ta in amounts of from 0.01-3 atomic %, or contains Au in amounts of 0.01-10 atomic %. The silver alloy contains one or more elements selected from the group of Ti, Zr, Hf, V, Nb, Ta, Mg, Ca, Sr and Ba in amounts of from 0.01 to 3 atomic %, or one or more elements selected from the group of Au, Al, Ga, In and Sn in amounts of 0.05 to 5 atomic %. The base material is filled with a Bi-containing oxide of Bi.sub.1 Pb.sub.u Sr.sub.x Ca.sub.y Cu.sub.z O.sub.w wherein u=0-0.3, X=0.8-1.2, y=0.2-1.2, and z=0.8-2.0, and processed to obtain a superconductive wire or tape having enhanced mechanical strength, superconductivity and plastic workability.Type: GrantFiled: December 21, 1993Date of Patent: September 2, 1997Assignees: Sumitomo Heavy Industries, Ltd., National Research Institute for MetalsInventors: Yoshiaki Tanaka, Tomoyuki Yanagiya, Fumiaki Matsumoto, Masao Fukutomi, Toshihisa Asano, Kazunori Komori, Hiroshi Maeda
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Patent number: 5567288Abstract: A substrate electrode having a plurality of substrate holders capable of causing a substrate to tilt by an arbitrary angle .theta. relative to the horizontal plane is provided. A plurality of auxiliary electrodes are arranged substantially vertically below the substrate electrode and between the substrate electrode and a target. The substrate electrode and the auxiliary electrodes are electrically insulated from the target. Bias voltage applied to the substrate electrode and the auxiliary electrodes causes the plasma boundary between the cathode dark space and the negative glow to form a cathodic plasma space having a parabolic section, thus forming a crystal-oriented thin film on the substrate surface.Type: GrantFiled: September 27, 1994Date of Patent: October 22, 1996Assignees: Mituba Electric Mfg. Co., Ltd., National Research Institute for MetalsInventors: Masao Fukutomi, Shigeki Aoki, Kazunori Komori, Toshihisa Asano, Yoshiaki Tanaka, Hiroshi Maeda
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Patent number: 5145829Abstract: A compacted and highly oriented microstructure of the bulk-shaped Bi-Sr-Ca-Cu-O system oxide superconductor is obtained by the intermediate pressing method of the present invention. The growth rate of the high critical temperature phase in the bulk of Pb-doped Bi-Sr-Ca-Cu-O system oxide superconductor is also much improved and the sintering duration for obtaining a single phase having a high critical temperature is shorteneed by this method. Additionally, a higher critcal current density of Bi-Sr-Ca-Cu-O system oxide superconductor is obtained by the working under pressure process after cooling between a first and a second sintering step. Furthermore, the magnetic field dependence of the critical current density of Bi-Sr-Ca-Cu-O system oxide superconductor is also improved by the method of the present invention.Type: GrantFiled: August 22, 1989Date of Patent: September 8, 1992Assignee: National Research Institute for MetalsInventors: Toshihisa Asano, Yoshiaki Tanaka, Masao Fukutomi, Hiroshi Maeda
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Patent number: 5096878Abstract: A method for making superconductive ceramics laminates comprises forming a thick film of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen on a flat plane of a substrate, and orienting and crystallizing the thus formed film by heat treatment to cause the c-axis of composite oxide crystals to be substantially perpendicular to said flat plane of said substrate. An intermediate layer formed of a noble metal, MgO, SrTiO.sub.3, yttria-stabilized zirconia or an oxide of a superconductive ceramics-constituting element may be interposed between the film and the substrate.Type: GrantFiled: January 28, 1991Date of Patent: March 17, 1992Assignees: Mitsui Kinzoku Kogyo Kabushiki Kaisha, National Research Institute for Metals, Science and Technology AgencyInventors: Kazutomo Hoshino, Shigeru Yamazaki, Hidefusa Takahara, Masao Fukutomi