Diffusion control layers for diffusion transfer photographic film
US4391895A · kind A · utility
5Cited by
4References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1981 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Jan 2, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/54
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diffusion control layer for a diffusion transfer photographic film unit comprising a urethane polymer including recurring backbone units capable of undergoing .beta.-elimination degradation in an alkaline environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.