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:
Nov. 25, 1997
Filed:
Mar. 22, 1996
Michael Bryan, Watford, GB;
Michael Tadeusz Gorecki, Harrow, GB;
Terry Douglas Haynes, Croxley Green, GB;
Eastman Kodak Company, Rochester, NY (US);
Abstract
Photographic emulsions comprise silver halide grains which are generally produced by reacting an aqueous silver salt solution, and an aqueous halide solution in an aqueous gelatin solution in a reaction vessel. However, it may often be difficult to control the formation of the grains to produce consistent and reproducible emulsions. Described herein is an improved nucleation device for mixing photographic emulsions. The device has three inlets through which the silver salt solution, the halide solution and the gelatin are introduced into the device. The inlets are respectively connected to tube member and passages, the tube member and passages being concentrically disposed about an axis. Solutions from the tube member and passage impinge on a rotating rotor in a first mixing zone. Solution from passage mixes with the mixture from the first mixing zone at a second mixing zone spaced therefrom.