Patents Represented by Attorney Carl Ruoff

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  • Phosphor containing barium and lead
    Patent number: 5223341
    Abstract: A phosphor of the type utilized in a fluorescent lamp and which includes core elements barium, lead, silicon, and oxygen where a continuous, conformal outer coating of hydration and solubilization resistant aluminum oxide, which is impermeable to migration of the core elements, surrounds the core whereby the outer surface of the core is substantially entirely free of the core elements.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: June 29, 1993
    Assignee: GTE Products Corporation
    Inventor: A. Gary Sigai