Device to indicate the concentration of ethylene oxide in the workplace
US4597942A · kind A · utility
43Cited by
7References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1983 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Aug 15, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/142222
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A visual indicator device and dosimeter in which a liquid crystal composition deposited on an opaque dark-colored carrier substrate undergoes color changes which depend on the concentration, and total quantity, of ethylene oxide to which the device has been exposed. The device serves both to monitor the concentration of ethylene oxide in the environment and to indicate a time-weighted average exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.