Patents Assigned to Finch International Limited
  • Very high temperature and atmospheric pressure superconducting compositions and methods of making and using same
    Patent number: 6465739
    Abstract: Ceramic compositions which exhibit the phenomenon of superconductivity are disclosed. Methods of making and using the compositions are included. The compositions comprise 1-2-3 ceramic compositions (e.g., Y, Ba, Cu/Ag) with the fourth constituent comprising sulfur, selenium or tellurium. Unexpectedly high temperature (e.g., non-cryogenic) and essentially atmospheric pressure superconductor characteristics are shown.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: October 15, 2002
    Assignee: Finch International Limited
    Inventors: Basil D. Shepherd, David L. Shaw
  • Ceramic materials and methods of making the same comprising yttrium, barium, silver, and either selenium or sulfur
    Patent number: 5518972
    Abstract: Disclosed are ceramic materials and methods of making the same comprising yttrium, barium, silver, and either selenium or sulfur. Those ceramic materials show changes in magnetic susceptibility at around 373.degree. K. with selenium and 195.degree. K. with sulfur.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: May 21, 1996
    Assignee: Finch International Limited
    Inventors: Basil D. Shepherd, David L. Shaw