Concentrated color developer composition used for silver...

Details Concentrated color developer composition used for silver... Concentrated color developer composition used for silver...

2005-05-31

2005-05-31

Le, Hoa Van (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

C430S486000, C430S491000, C430S492000

Reexamination Certificate

active

06900004

ABSTRACT:
A one-part photographic developing concentrate comprising: (i) a paraphenylene diamine color developing agent; and (ii) a water-soluble organic solvent, wherein a molar ratio of sodium ion to potassium ion is at least 3, and a molar ratio of sulfate ion to carbonate ion is at least 0.25.

REFERENCES:
patent: 6413703 (2002-07-01), Tappe et al.
patent: 1293654 (1972-10-01), None
patent: WO/02/25371 (2002-03-01), None
European Search Report EP 03 25 4880.

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