Apparatus for controlling addition of replenishment solution to a photographic processor

USRE30123E · kind E · reissue

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• John A. Crowell · Wilmington, US
• Alan Bull · Ashford, GB

Key dates

• Filing date: Jul 6, 1976
• Grant date: Oct 23, 1979
• Expiry date: Jul 6, 1996

Classification

• Technology area (CPC —): General

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.