Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1978-08-21
1980-06-10
Prescott, Arthur C.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204 94, 204130, 204151, C25B 124, C25B 1104, B01D 1302
Patent
active
042071577
ABSTRACT:
The concentration of halogen ions in a photographic developer is controlled at an almost constant value by determining the concentration of halogen ions in the developer by detecting the change in electric potential caused by the addition of silver ions to the solution, and controlling the electrical current supplied to a halogen ion removing means, such as an electrodialysis or an electrolysis unit having an anion exchange membrane, based on the result of the determination of halogen ions. By this method the amount of complementary developer added to a fatigued developer solution can be greatly reduced.
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patent: 3647422 (1972-03-01), Wainer
patent: 4060419 (1977-11-01), Gerber et al.
patent: 4102758 (1978-07-01), Gerber et al.
Wilson, "Demineralization by Electrodialysis", (1960), to 433 P7 C. 2, pp. 2-5.
Fales et al, "Inorganic Qualitative Analysis", Appleton-Century-Crofts, Inc., 3rd Ed., pp. 232-235.
Hirai Hiroyuki
Matsushita Sachio
Tsuyuki Isao
Watase Kazumi
Fuji Photo Film Co. , Ltd.
Prescott Arthur C.
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