Medical temperature measuring device
Carbon dioxide absorption canister for use with analgesia equipment
Respirator cartridge end-of-service life indicator
Underwater breathing apparatus Patent #: 4273120
ApplicationNo. 06/276519 filed on 06/23/1981
US 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 analysis
ExaminersPrimary: Recla, Henry J.
Attorney, Agent or Firm
International 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.