Machine readable colored envelopes
US7684997B2 · kind B2 · utility
1Cited by
15References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 27, 2006 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Nov 21, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00717
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Systems and methods for providing a machine readable colored envelope and systems and methods for processing such envelopes are described. In certain examples, the machine readable colored envelopes are colored using a reversible negative photochromic colorant that bleaches when exposed to an activation energy such as ultraviolet radiation and returns to its original color after the activation energy is removed. In another example, the colorant has more than one stable color state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.