Patent · US Expired

Apparatus for continuously processing photographic films or the like

US4182567A · kind A · utility

15Cited by

5References

9Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Erwin Laar · Taufkirchen, DE
Karl Wagner · Munich, DE
Siegfried Krauss · Weilheim, DE

Key dates

Filing date	Jul 17, 1978
Grant date	Jan 8, 1980
Priority date	—
Expiry date	Jul 17, 1998

Classification

Technology area (CPC G)Physics
CPC primaryG03D3/02
WIPO fieldOptics
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.