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:
Aug. 06, 1985
Filed:
Jul. 18, 1983
Andrew W Yates, Knutsford, GB;
Brian D Harradine, Macclesfield, GB;
Michael A Wraith, Stretford, GB;
Ciba-Geigy AG, Basel, CH;
Abstract
Process for the preparation of silver halide emulsions containing populations of monodispersed silver halide crystals, which comprises transferring an amount of monodispersed silver halide crystals from a reaction vessel to a holding vessel, effecting growth of the silver halide crystals remaining in the reaction vessel, transferring the monodispersed silver halide crystals thus obtained to a further holding vessel followed by another growth step of the silver halide crystals left in the reaction vessel, combining all the populations of monodispersed silver halide crystals of different crystal size, and carrying out the steps required to produce a fully sensitized and concentrated silver halide emulsion. These emulsions when used in photographic materials exhibit a reduced contrast and a relatively high sensitivity.