Radiation imagery chemistry: process – composition – or product th – Nonradiation sensitive image processing compositions or...
Reexamination Certificate
2006-03-07
2006-03-07
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Nonradiation sensitive image processing compositions or...
C430S567000, C430S569000
Reexamination Certificate
active
07008761
ABSTRACT:
A process for the preparation of a radiation-sensitive silver halide emulsion comprised of high bromide cubical silver halide grains, the process comprising: (a) providing in a stirred reaction vessel a dispersing medium and high bromide silver halide grain cores, the grain cores comprising at least 5 mole % of the final emulsion silver and the contents of the vessel being maintained at a temperature of at least about 65° C., and (b) precipitating a high bromide silver halide shell which comprises at least 5 mole % of the final emulsion silver onto the grain cores by introducing at least a silver salt solution into the dispersing medium at a specified high rate, wherein a minor percentage of chloride ions, relative to bromide, is introduced into the reaction vessel prior to or concurrent with precipitation of the high bromide shell, and wherein the concentration of silver halide grains in the reaction vessel at the end of the precipitation of the shell is at least 0.5 mole/L. The invention provides an improved manufacturing process for the preparation of high bromide silver halide cubical grain emulsion enabling concentrated emulsion batches to be prepared with desired photographic properties.
REFERENCES:
patent: 3650757 (1972-03-01), Irie et al.
patent: 3672900 (1972-06-01), Kurz
patent: 4067739 (1978-01-01), Lewis
patent: 4242445 (1980-12-01), Saito
patent: 4301241 (1981-11-01), Saito
patent: 4539290 (1985-09-01), Mumaw
patent: 4666669 (1987-05-01), Mumaw
patent: 4914014 (1990-04-01), Daubendiek et al.
patent: 5089379 (1992-02-01), Yatsuyanagi
patent: 5104785 (1992-04-01), Ichikawa et al.
patent: 5372927 (1994-12-01), Delton
patent: 5549879 (1996-08-01), Chow
patent: 5807666 (1998-09-01), Adin et al.
patent: 5840473 (1998-11-01), Mydlarz et al.
patent: 5849470 (1998-12-01), Mydlarz et al.
patent: 5908740 (1999-06-01), Maskasky et al.
patent: 5985535 (1999-11-01), Urabe
patent: 6043019 (2000-03-01), Jagannathan et al.
patent: 6048683 (2000-04-01), Mehta et al.
patent: 6136523 (2000-10-01), Jezequel et al.
patent: 6265145 (2001-07-01), Mehta et al.
patent: 6623918 (2003-09-01), Hasberg et al.
patent: 6753134 (2004-06-01), Hasberg et al.
patent: 2004/0018456 (2004-01-01), Hasberg et al
patent: 2107118 (1970-02-01), None
“Growth Mechanism Of AgBr Crystals In Gelatin Solution”; of J. S. Wey et al; Photographic Science And Engineering; vol. 21; No. 1; Jan./Feb. 1977; pp. 14-18.
Research Disclosure; vol. 382; Feb. 1996; Item 38213; titled “Mixer For Improved Control Over Reaction Environment”; pp. 111-114; Disclosed Anonymously.
Anderson Andrew J.
Eastman Kodak Company
Letscher Geraldine
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