Photographic reflection print material with improved keeping properties
US4994147A · kind A · utility
15Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jul 25, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/79
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of making a photographic paper support having improved raw stock keeping characteristics by an internal acid sizing step and an external alkaline sizing step to achieve a water extractable pH of from 6 to 9.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.