Soda lime half life indicator
US4440162A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1981 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Jun 23, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/34
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention disclosed is an indicator for monitoring the capacity of a CO.sub.2 absorbent to absorb CO.sub.2. The indicator is typically used in association with a closed circuit breathing apparatus, including a container for a CO.sub.2 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 CO.sub.2 absorbent to absorb CO.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.