Environmental quality indicator
US4092119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1975 |
| Grant date | May 30, 1978 |
| Priority date | — |
| Expiry date | Jul 11, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2462
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A scuff-resistant, waterproof environmental quality indicator suitable for field use to blot-test unknown spills or wet containers, as field markers of spray distribution, as floating markers of water contamination, as personnel protection badges and as integrating dosimeters. The environmental quality indicator has a topographically varying surface having substantially uniformly located raised portions defining the scuffing and abrasion level and relieved portions beneath the scuffing and abrasion level to protect the indicator formulation from physical environmental hazards, which can produce an initial false indication, while remaining freely exposed to chemical environmental hazards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.