Universal product code marking composition containing a photosensitive dye former, a pigment and a binder and the use thereof
US4029506A · kind A · utility
22Cited by
8References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1976 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Sep 22, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Described are a marking composition of a color-forming, radiation-sensitive component, a diffusely reflecting pigment and a binder, and a process for the use of the same comprising coating a product surface with the marking composition; exposing the coating to a pattern of radiation to form a marking; and then reading the marking with a diffuse reflectance scanning means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.