Patents Represented by Attorney Jack Springgate

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  • Drill bit
    Patent number: 3990751
    Abstract: A roller cutter drill bit with a body having a journal, a roller cutter, bearing means for rotatively mounting the roller cutter on the journal and a part of said bearing means including a maraging steel sleeve with a lubricant between the sleeve and the journal and between the sleeve and the roller cutter to prevent galling.
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: November 9, 1976
    Assignee: Reed Tool Company
    Inventor: Henry W. Murdoch