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Warning device to indicate the state of gases exhaustion of a gas filter retaining dangerous gases

  • US 4,873,970 A
  • Filed: 03/10/1989
  • Issued: 10/17/1989
  • Est. Priority Date: 04/22/1986
  • Status: Expired due to Term
First Claim
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1. A warning device for indicating the exhaustion of a separate gas filter retaining a toxic gas which device functions independently from the gas filter and comprises:

  • a housing having an inlet and an outlet through which gas is able to enter and leave the housing;

    electrochemical means for directly detecting the overall concentration of the toxic gas that enters the housing from the gas filter, said electrochemical means disposed within the housing;

    means for alerting disposed on the housing; and

    means for activating the alerting means when a predetermined concentration of toxic gas is detected, said activation means disposed within said housing.

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