Patents Represented by Attorney Carl F. Rouff

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  • Ceramic guide rails for photographic film and paper and polymeric web perforation
    Patent number: 6117805
    Abstract: Ceramic guide rails for guiding photographic film into a perforating machine are disclosed. The ceramic includes zirconium oxide and yttria in a molar ratio of yttria to zirconium oxide of from about 3:97 to about 5:95. The zirconium oxide is essentially the tetragonal phase crystal grain. In an alternate embodiment of the present invention the outer surface of the zirconium oxide is altered to the cubic phase crystal grain or the monoclinic crystal grain.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: September 12, 2000
    Assignee: Eastman Kodak Company
    Inventors: Syamal Kumar Ghosh, Dilip Kumar Chatterjee, Theodore R. Kolb