Invisible information recorded medium
US5503904A · kind A · utility
42Cited by
28References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Jan 19, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24942
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to provide an invisible information recorded medium having an identification mark. In order to achieve the object, an invisible information recorded medium is provided having an identification mark recorded thereon, the identification mark being composed of a region having a high reflectance and a region having a low reflectance as compared with the reflectance of the medium in the same near infrared ray region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.