System for the visualization of exposure to ultraviolet radiation
US5028792A · kind A · utility
105Cited by
8References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Apr 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/73
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Photochemical systems for the direct visualization of exposure to ultraviolet radiation that effect visible color changes involving a process in which a photoacid is formed upon irradiation of a nitro-substituted aromatic aldehyde with ultraviolet light and wherein proton transfer to a dye causes the dye to undergo a visible color change. The system undergoes such color change to an extent directly proportional to the cumulative amount of ultraviolet incident thereupon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.