Process and apparatus for controlling the concentration of diazo

Details Process and apparatus for controlling the concentration of diazo Process and apparatus for controlling the concentration of diazo

1974-09-04

1977-05-24

Cline, William R.

Fluid handling

Self-proportioning or correlating systems

Mixture condition maintaining or sensing

137 93, 96 49, 137393, 222358, G05D 1102

Patent

active

040248852

ABSTRACT:
A reserve supply of diazotype developing liquid from which liquid is supplied to semi-dry diazotype developing apparatus is maintained at both a substantially constant level and the required concentration of azo coupling component by introducing solvent for the liquid to restore the liquid level upon a decrease of the supply volume, sensing the specific gravity of the supply liquid by a hydrometer, and counteracting the decrease of concentration resulting from solvent addition by introducing a liquid concentrate containing the azo coupling component and electrolyte in response to a lowering of the hydrometer.

REFERENCES:
patent: 871580 (1907-11-01), Forrester
patent: 1719898 (1929-07-01), McNeil
patent: 2100316 (1937-11-01), Harper
patent: 2600937 (1952-06-01), Strattman
patent: 3117381 (1964-01-01), Durkin
patent: 3195551 (1965-07-01), Russell
patent: 3241718 (1966-03-01), Kemper

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