Hologram stabilizing assembly and method
US4789211A · kind A · utility
17Cited by
2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Feb 13, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The holograph assembly has first and second hydrophobic substrates layers (14, 12) which carry therebetween a water absorbent layer (16). The holographic image layer (18) is protected against moisture from that side because the water absorbent layer acts as a sponge for the moisture diffusing through the first substrate (14). The upper side of the image layer is protected by first and second cover layers (20, 22) and second water absorbent cover layer (24), all of which must be transparent to view the holographic image. An adhesive may be applied between layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.