Patents Assigned to Showa Cabot Supermetals K. K.
  • Tantalum powder and method of making
    Patent number: 4645533
    Abstract: The dielectric characteristic and resistance against the dielectric characteristic deterioration of tantalum powder for use in a solid electrolyte capacitor are improved by incorporating phosphorus and boron dopant sources into tantalum material at the reducing step of K.sub.2 TaF.sub.7 or by incorporating one of the two dopant sources at the reducing step and the other dopant source at the heat-treating step.
    Type: Grant
    Filed: January 17, 1985
    Date of Patent: February 24, 1987
    Assignee: Showa Cabot Supermetals K. K.
    Inventor: Tomoo Izumi