An end-of-service-life-indicator for a multi-agent respirator filter that is safe, reliable, and easy to read and may be configured to cover a broad range of threats, including chemical warfare agents and toxic industrial chemicals, is achieved by positioning an array of chemically reactive calorimetric...http://www.google.es/patents/US7442237?utm_source=gb-gplus-sharePatente US7442237 - Multi-agent end-of-service-life indicator for respirator filters
Multi-agent end-of-service-life indicator for respirator filters
