Fluid handling – Systems – Programmer or timer
Patent
1976-07-06
1979-10-23
Cohan, Alan
Fluid handling
Systems
Programmer or timer
354297, 222 70, G05D 300
Patent
active
RE0301230
ABSTRACT:
An apparatus for controlling make-up and addition of replenishment solution to a photographic processor, having one or more reservoirs and metering pumps for selecting make-up solution concentrates, and electronic controls for determining the volume of replenishment solution. Replenishment can be accomplished taking into consideration all of the operating variables such as film size, replenishment rate, and percent exposure, as well as the cumulative effect of any additions and aerial oxidation of the solution while not in use.
REFERENCES:
patent: 3334566 (1967-08-01), Friedel
patent: 3529529 (1970-09-01), Schumacher
patent: 3561344 (1971-02-01), Frutiger et al.
Bull Alan D.
Crowell John A.
Cohan Alan
E. I. Du Pont de Nemours and Company
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