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:
Jul. 23, 2002
Filed:
Jun. 21, 2000
Michael G. Antoniades, Rochester, NY (US);
Harold G. Judd, Bolingbrook, IL (US);
Katrin I. Parsiegla, Rochester, NY (US);
Benjamin T. Chen, Penfield, NY (US);
Douglas E. Singer, Rochester, NY (US);
Donald R. Irwin, Rochester, NY (US);
Sucheta Tandon, Fairport, NY (US);
Jess B. Hendricks, III, Rochester, NY (US);
Heinz E. Stapelfeldt, Pittsford, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A mixer for preparing silver halide grains for photographic use has upper and lower impellers housed in a draft tube. The bottom impeller has flat blades for micromixing silver and halide reactants introduced into the bottom of the draft tube. The upper impeller has pitched blades for macromixing the bulk fluid. The impellers are spaced apart at least the distance of their diameters so that the upper and lower impellers operate independently of one another so that micromixing is independent of macromixing. A flow disrupter structurally associated with the draft tube and positioned above the top impeller prevents vortexing of the fluid during mixing. Baffles may be provided in the draft tube to discourage vortexing.