Patents by Inventor Yu Shiohara

Yu Shiohara 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).

  • Process for preparing oxide superconductor
    Patent number: 5430010
    Abstract: The present invention relates to a process for preparing an oxide superconductor having a high critical current density, a uniform structure and an excellent mechanical property and thermal stability, which comprises heating raw material powders of a REBaCuO system at 1050.degree. C. or higher, cooling the material for solidification, pulverizing and mixing the solidified material to homogeneously disperse the structure of the solidified material, molding the material, optionally mixed with silver oxide or silver, into a predetermined shape, and reheating the molding to 1050.degree. C. or higher to grow a superconducting phase.
    Type: Grant
    Filed: June 8, 1993
    Date of Patent: July 4, 1995
    Assignees: International Superconductivity Technology Center, Nippon Steel Corporation
    Inventors: Masato Murakami, Terutsugu Oyama, Hiroyuki Fujimoto, Naoki Koshizuka, Yu Shiohara, Shoji Tanaka
  • Method of producing YBa.sub.2 Cu.sub.4 O.sub.x -type superconducting metal oxides
    Patent number: 5306696
    Abstract: A method of producing a superconductor of metal oxides having the following composition:(M.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.4 O.sub.8wherein M stands for a rare earth element, x is 0 or a positive number of less than 1 and y is 0 or a positive number of less than 1, is disclosed, which includes hydrdolyzing an organic solvent solution or dispersion containing (a) alkoxide or fine particulate of a hydroxide of the rare earth element M, (b) alkoxides orfine particulate of hydroxides of Ca, Ba and Sr and (c) alkoxide, nitrate or fine particulate of hydroxide of copper in presence of water and nitrate ions. The alkoxides or hydroxides of Ca and Sr are present only when x and y are not zero, respectively. The hydrolyzed product is then dried, shaped and pyrolyzed to obtain the superconductor.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: April 26, 1994
    Assignees: Kabushiki-Gaisha Arubakku Kohporehiosentah, Nippon Mining Co., Ltd., Ishikawajima-Harima Jukogyo Kabushiki Kaisha, International Superconductivity Technology Center
    Inventors: Hirohiko Murakami, Junya Nishino, Seiji Yaegashi, Yu Shiohara, Shoji Tanaka
  • Method of producing superconductor of metal oxides
    Patent number: 5236890
    Abstract: A method of producing a superconductor of metal oxides which includes subjecting an organic solvent solution containing (a) an alkoxide of a rare earth element, (b) an alkoxide of an alkaline earth metal and (c) copper alkoxide or cupric nitrate to hydrolysis in the presence of water and nitrate ions, thereby forming a mixture containing a gel-like substance. The gel-like substance is, after being dried and formed into a desired shape, pyrolyzed at a temperature of 600.degree.-950.degree.C. to form a superconductor of oxides of the rare earth, the alkaline earth metal and copper.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: August 17, 1993
    Assignees: Kabushiki-Gaisha Arubakku Kohporehtosentah, Nippon Mining Co., Ltd., Ishikawajima-Harima Jukogyo Kabushiki Kaisha, The International Superconductivity Technology Center
    Inventors: Hirohiko Murakami, Junya Nishino, Seiji Yaegashi, Yu Shiohara, Shoji Tanaka