Stabilization of holograms formed in gelatin
US5795681A · kind A · utility
Inventors
Key dates
| Filing date | Mar 24, 1997 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Mar 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention pertains to a process for the stabilization of Holograms formed on gelatin. According to the invention, after (i) exposing, (ii) developing, and (iii) quenching said Hologram, there is added thereto (iv) a bleaching bath based on an oxidative cross-linking agent at a pH value of at least 3 or more, and thereafter, following (v) rinsing, (vi) fixing, (vii) additional rinsing and (viii) a final bath, (ix) said support material is dehydrated by the use of one or more baths in series containing a solvent which is water-miscible and does not affect the cured gelatin structure. In another embodiment, the invention pertains to light-directing wall elements for buildings made of a Holograms obtainable by the process mentioned above and applied to a transparent or opaque substrate. By means of the present invention, silver-free holographic support materials can be prepared.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.