Purifying Powdered Metal Or Reducing Powdered Metal Compound To Free Metal Patents (Class 75/369)
  • Magnetic powder for magnetic recording media and method for producing same
    Patent number: 5151115
    Abstract: A metal magnetic powder for magnetic recording media consisting essentially of iron is obtained by providing a hydrous needle-like iron oxide powder as a starting material, applying cobalt ions on the surface thereof, and subsequently reducing the resultant powder in a reducing atmosphere. The metal magnetic powder contains cobalt in an amount not less than 6 weight % relative to iron, and the coercive force of the powder is not more than 1600 Oe.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: September 29, 1992
    Assignee: TDK Corporation
    Inventor: Kiminori Tamai
  • Method for controlling the oxygen content of tantalum material
    Patent number: 4964906
    Abstract: A process for controlling the oxygen content in tantalum material comprising heating the material under a hydrogen-containing atmosphere in the presence of a tantalum getter metal having an initial oxygen content lower than the tantalum material.
    Type: Grant
    Filed: September 26, 1989
    Date of Patent: October 23, 1990
    Inventor: James A. Fife