Soda lime half life indicator
Patent 4440162 Issued on April 3, 1984. Estimated Expiration Date: 
June 23, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 23, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3773044 Medical temperature measuring device Carbon dioxide absorption canister for use with analgesia equipment Respirator cartridge end-of-service life indicator Fertility indicator Underwater breathing apparatus Patent #: 4273120 InventorsAssigneeApplicationNo. 06/276519 filed on 06/23/1981US Classes:128/202.22, Means for indicating improper condition of apparatus128/202.26, Gas produced by electrolysis or chemical reaction340/540, Specific condition340/588, Time-temperature relationship (e.g., overtemperature exceeds predetermined interval or time-temperature integral)340/604, Wetness436/147, MEASUREMENT INCLUDES TEMPERATURE CHANGE OF THE MATERIAL BEING ANALYZED (E.G., CALORIMETRY, ETC.)436/39, DETERMINATION OF WATER73/23.2, GAS ANALYSIS73/23.3Breath analysisExaminersPrimary: Recla, Henry J.Attorney, Agent or FirmInternational ClassesA62B 18/08 (20060101)A62B 18/00 (20060101) AbstractThe invention disclosed is an indicator for monitoring the capacity of a CO2 absorbent to absorb CO2. The indicator is typically used in association with a closed circuit breathing apparatus, including a container for a CO2 absorbent. The indicator comprises temperature sensing means immersed in the absorbent, a temperature to voltage converter for converting a sensed temperature reading to an electrical voltage signal, temperature trend processing means for processing said electrical voltage signal into a selected electrical output signal characteristic of a temperature trend; and display means for converting said selected electrical output signal to a predetermined visual display indicative of the capacity of the CO2 absorbent to absorb CO2. |
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