Irreversible photochromic markings
US4812171A · kind A · utility
20Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1988 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Apr 7, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31504
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A photochromic ink composition which comprises a solution of a 1,2-dihydroquinoline (DHQ) in a polymer solution, the dihydroquinoline being sensitive or sensitized to ultra-violet light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.