Multi-band liquid crystal film laminate
US4246302A · kind A · utility
21Cited by
2References
13Claims
0Family size
Inventors
Key dates
| Filing date | Jun 27, 1979 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | Jun 27, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31565
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A multi-band liquid crystal film for visual observation of two or more patterns is prepared by laminating at least two polyurethane films, each containing discrete aggregates of liquid crystals against a black film such that the visual response of the liquid crystals of each succeeding polyurethane film is different than that of the liquid crystals in the other film or films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.