Radiation imagery chemistry: process – composition – or product th – Silver halide colloid tanning process – composition – or product – Process using lithographic infectious developer
Patent
1996-02-13
1996-08-13
Le, Hoa Van
Radiation imagery chemistry: process, composition, or product th
Silver halide colloid tanning process, composition, or product
Process using lithographic infectious developer
430264, 430268, 430435, 430436, 430438, 430439, 430478, 430482, 430492, G03C 5305
Patent
active
055455085
ABSTRACT:
A process for forming a black-and-white high contrast negative photographic silver image by development of a silver halide photographic element with an aqueous alkaline photographic developer composition comprising a dihydroxybenzene developing agent, an auxiliary superadditive developing agent, an antifogging agent, an antioxidant compound, a combination of buffering agents and a sequestering agent, characterized by the fact that: a) the auxiliary developing agent is an aminophenol compound, b) the combination of buffering agents comprises at least a first buffering agent represented by carbonate compounds and at least a second buffering agent represented by phosphate compounds, the total amount of said first buffering agent and said second buffering agent being at least 35 grams per liter, band c) the pH of said aqueous alkaline photographic developer composition is in the range 9.0 to 11.0.
REFERENCES:
patent: 4756997 (1988-07-01), Marchesano
patent: 5374498 (1994-12-01), Fujita et al.
Faranda Filippo
Marchesano Carlo
Moizo Elda
Griswold Gary L.
Kirn Walter N.
Le Hoa Van
Litman Mark A.
Minnesota Mining and Manufacturing
LandOfFree
Photographic silver halide developer compositions and process fo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photographic silver halide developer compositions and process fo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic silver halide developer compositions and process fo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1047137