Patents Represented by Attorney T. J. Greer

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  • Zirconia pen balls
    Patent number: 4621936
    Abstract: A liquid transfer ball formed from sintered zirconium oxide particles which exhibits utility as the ball element of a ball pen writing instrument to transfer ink from an ink reservoir to a writing surface such as paper. The ball exhibits a porosity of less than 8% by volume and is immune to corrosive action of inks.
    Type: Grant
    Filed: October 14, 1983
    Date of Patent: November 11, 1986
    Assignee: Corning Glass Works
    Inventors: John N. Hansson, Herbert L. Johns