Method of warning of poisoning in poison resistant...

Measuring and testing – Gas analysis – With compensation detail

Reexamination Certificate

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C073S001010, C073S001020, C073S023200, C073S023230, C073S023310, C073S023320, C422S083000, C422S094000, C422S095000, C422S096000, C422S097000, C422S098000, C029S592000, C029S592100, C029S593000

Reexamination Certificate

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07007542

ABSTRACT:
A poison resistant combustible gas sensing element, a method for its production and a method for determining poisoning of the element. The element includes an electric heating element, an inner layer coated on the electric heating element and containing a precious metal catalyst supported on a porous oxide, the precious metal catalyst catalyzing combustion of a combustible gas to be detected by the element, and an outer layer overlaying the first layer, and containing a catalytic compound capable of trapping gases which poison the precious metal catalyst, the catalytic compound being supported on a porous oxide.

REFERENCES:
patent: 4246228 (1981-01-01), Jones et al.
patent: 5061447 (1991-10-01), Ono
patent: 5368713 (1994-11-01), Friese et al.
patent: 5401470 (1995-03-01), Poli

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