Method and apparatus for producing visual patterns with lenticular sheets
US4498736A · kind A · utility
45Cited by
5References
11Claims
0Family size
Inventor
Key dates
| Filing date | Feb 2, 1981 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Feb 2, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F19/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lenticular sheet system having an air gap between a pair of superimposed lenticular sheets which does not diminish or attenuate the spacial optical effect produced by the superimposed lenticular sheets and which is made possible by coating both sides of one of the lenticular sheets with a transparent coating having a coefficient of refraction slightly different than the coefficient of refraction of that sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.