Book on a pocket card
US4917292A · kind A · utility
65Cited by
13References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Apr 21, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/904
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A plastic card or credit card size has a strip of optical recording material thereon containing microtext. The microtext is either electronically or optically reduced from 5 to 200 times and laid out in miniature pages, arranged in an array on the strip. The strip has a metallic or metal particle layer, giving it a shiny gold or silver coloration, against which the microtext appears dark, or vice-versa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.