Method of preparing laminated holograms
US4976799A · kind A · utility
17Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Dec 8, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is described a method of preparing a hologram laminated between two sheets of glass which comprises forming an assembly which comprises a sheet of glass, a sheet of polyvinyl butyral, a film which contains a silver halide hologram, a sheet of polyvinyl butyral and a sheet of glass and then subjecting the assembly of a pressure of between 12 and 15 bars at a temperature about 110.degree. C. which is the softening temperature of polyvinyl butyral.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.