Processing photographic material

Details Processing photographic material Processing photographic material

1998-10-06

2000-08-22

Rutledge, D.

Photography

Fluid-treating apparatus

Having fluid-circulating means

396636, G03D 302

Patent

active

061061697

ABSTRACT:
Method and apparatus are disclosed for washing exposed photographic material in less time and with a reduced replenishment rate compared with conventional processing. Multi-stage counter-current washing is employed, in which the time that the material spends in each stage is such that equilibrium of chemical concentration between solution contained in the material and solution contained in the stages (a) is reached in the final stage, but (b) is reached in fewer than all the stages, and wherein the material resides in at least one stage for a time that is different from that in at least one other of the stages. Preferably the longest time is spent in the final stage. The time distribution throughout the stages can be optimized to produce a final tank concentration comparable to that obtained with conventional processing.

REFERENCES:
patent: 4178089 (1979-12-01), Spence-Bate
patent: 4265431 (1981-05-01), Falomo
patent: 4719173 (1988-01-01), Hahm
patent: 4929975 (1990-05-01), Shidara
patent: 5365300 (1994-11-01), Wernicke et al.
patent: 5573896 (1996-11-01), Carli et al.
patent: 5923916 (1999-07-01), Piccinini, Jr. et al.
Patent Abstracts of Japan, vol. 14, No. 274 (P-1061), Jun. 13, 1990 & JP 02 079841 A (Konica Corp.), Mar. 20, 1990.
Patent Abstracts of Japan, vol. 12, No. 396 (P-774), Oct. 21, 1988 & JP 63 138349 A (Konica Corp.), Jun. 10, 1988.

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