Patents Represented by Law Firm Frieshauf, Holtz, Goodman, Langer & Chick, P.C.
  • Method of manufacturing oxide superconductor
    Patent number: 5652199
    Abstract: A method of manufacturing an oxide superconductor, including the steps of mixing oxide materials of the metals contained in an oxide superconductor represented by HgBa.sub.2 Ca.sub.2 Cu.sub.3 O.sub.8+y to prepare a powder mixture of the composition noted above, molding the powder mixture to prepare a molded body of a desired shape, and applying a heat treatment to the molded body within a hermetic container at a temperature sufficient for bringing about a solid phase reaction of the oxide materials for at least 20 hours.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: July 29, 1997
    Assignees: International Superconductivity Technology Center, Tohoku Electric Power Company, Inc., Sumitomo Electric Industries, Ltd.
    Inventors: Kazuyuki Isawa, Ayako Yamamoto, Seiji Adachi, Makoto Itoh, Hisao Yamauchi
  • Liquid crystal microprism array, free-space optical interconnector, and optical switch
    Patent number: 5648859
    Abstract: 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: Grant
    Filed: July 27, 1994
    Date of Patent: July 15, 1997
    Assignee: Nippon Telephone & Telegraph Corp.
    Inventors: Katsuhiko Hirabayashi, Tsuyoshi Yamamoto, Masayasu Yamaguchi, Hirofumi Yamazaki