Retroreflective article
US5117304A · kind A · utility
140Cited by
7References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Sep 21, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides improved, flexible retroreflective articles based upon an optically clear, aliphatic polyurethane polymer. The aliphatic polymer has a plurality of hard chain segments of the formula EQU --C(O)N(H)--C.sub.6 H.sub.10 --N(H)C(O)--.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.