Fluorescent substance, fluorescent composition, fluorescent mark carrier and optical reader therefor
US6303929A · kind A · utility
28Cited by
23References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Mar 11, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7777
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A mark to be detected containing a fluorescent substance capable of emitting light of a wavelength different from that of an exciting light, containing: PA1 a data area formed with a pattern corresponding to data to be recorded; and PA1 a lead-in area formed at a site that is scanned prior to irradiation with the exciting light upon the data area, the lead-in area continuing a sufficient length greater than the longest continuous portion of the pattern formed at the data area, and the lead-in area that is formed at the site containing a fluorescent substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.