Holographic game cards
US4681324A · kind A · utility
Inventors
Key dates
| Filing date | Jan 9, 1986 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Jan 9, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/0055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A deck of playing cards wherein part or all of the indicia indicating the value of each card is formed of a holographic image which is clearly viewable from one range of angles, such as angles at or near an axis perpendicular to the surface of each card, and is obscured at other angles outside of or oblique to such range of angles. In one form the entire front surface of each playing card is formed with holographic images, and in another form only images adjacent to the periphery of each card are formed holographically. Cards constructed in accordance with the disclosure render difficult or impossible the viewing of a player's hand by persons standing or sitting near the holder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.