Patents Represented by Attorney E. T. Okubo

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  • Carbon monoxide monitoring system
    Patent number: 4256694
    Abstract: Colorimetric indicator material comprising alumina impregnated with permanganate ion and silver ion which changes color from purple to brown in the presence of carbon monoxide is disclosed. A personal monitor containing permanganate ion and silver ion impregnated alumina which changes color completely when the carbon monoxide exposure over a given period of time exceeds a predetermined concentration is disclosed.
    Type: Grant
    Filed: June 5, 1978
    Date of Patent: March 17, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jerome W. McAllister, Gunter A. Kohler, Virtudes R. Lund