Electric heating – Microwave heating – Tunnel furnace
Patent
1978-07-17
1980-01-08
Hix, L. T.
Electric heating
Microwave heating
Tunnel furnace
354324, 219328, 219332, 219496, G03D 1300
Patent
active
041825675
ABSTRACT:
A continuous processor for exposed webs of photographic paper has several tanks and a system of hoses which connect the outlets in the lower portions with the inlets in the upper portions of the tanks. The liquid developer is circulated by a pump and is heated by a heater before it reaches the inlets. The pressure of liquid in the system of hoses is monitored by two pressure responsive switches which cause a control unit to arrest the motor of the pump and to deactivate the heater when the pressure drops below or rises above a range of acceptable pressures. The pressure drops in response to leakage of developer, and the pressure rises in response to clogging of a filter which is installed in the system of hoses between the heater and the inlets of the tanks.
REFERENCES:
patent: 3781520 (1973-12-01), Gardom
patent: 3851662 (1974-12-01), Jessop
patent: 3873808 (1975-03-01), Patton
patent: 3978506 (1976-08-01), Geyken et al.
patent: 4104668 (1978-08-01), Laar
Krauss Siegfried
Laar Erwin
Wagner Karl-Heinz
AGFA-Gevaert A.G.
Hix L. T,.
Kontler Peter K.
Mathews Alan
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