Infrared couplers for incorporating and recovering metadata
US6521395B1 · kind B1 · utility
13Cited by
6References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2002 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Jan 30, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention relates to a silver halide photographic element containing a phenolic infrared dye-forming coupler bearing in the 2-position either a benzamido group substituted with a sulfonyl group or a heterocyclic carbonamido group, and bearing in the 5-position a non-carbonamido group, which element is useful for incorporating and recovering metadata, such as sound data, into a photographic image and is specifically concerned with the incorporation of non-visually perceptible sound information into a photograph.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.