The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 1979
Filed:
Sep. 12, 1977
AGFA-GEVAERT N.V., Mortsel, BE;
Abstract
A photosensitive silver halide emulsion is prepared by circulating separate streams of circulating peptizer solution with at least one power operated pump through separate mixing zones in which one stream is mixed with a solution of a silver salt and the other is mixed with a solution a halide salt, and these streams are then combined and mixed in a reaction zone so that silver halide crystals are formed by reaction between silver salt and halide salt and the circulating peptizer solution contains increasing amounts of silver halide crystals in course of time, such circulation being continued until a silver halide emulsion of a predetermined concentration has been formed. Each of the separate streams of peptizer solution is forced through its respective separate mixing zone and into the reaction zone from the nozzle of a venturi-type pump and a stream of the silver salt solution and/or the halide salt solution as the case may be is caused to feed into the respective separate mixing zone under the influence of and at a flow rate dependent on the venturi suction effect of the corresponding venturi-type pump, the venturi pumps being operated under such conditions as to damp high frequency (above 1 Hz) pAg oscillations attributable to the inherent characteristics of the pump.