Hologram identification device
US4563024A · kind A · utility
75Cited by
1References
13Claims
0Family size
Inventor
Key dates
| Filing date | Mar 16, 1983 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Mar 16, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/904
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An identification device in the form of a security card or anti-counterfeiting label which comprises a hologram visible by reflection in incident natural light, the film emulsion having been permanently deformed so that the interference fringe spacings differ from those in a non-deformed emulsion, thereby to change from one part of the hologram to another the wavelength of light which is visible by reflection from the hologram.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.