Patents Examined by David Leroy
  • Stress relieved grinding ball having hard outer shell
    Patent number: 6632303
    Abstract: A grinding ball having a 55 to 65 Rockwell C hardened outer shell of tempered martensite is adapted for use in a heavy duty grinding environment by stress relieving to stabilize the ball against break-up and/or spalling.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: October 14, 2003
    Assignee: Stelco Inc.
    Inventor: Christian Albert Jager