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:
Sep. 11, 1984
Filed:
Aug. 24, 1983
Mario Fryberg, Praroman-le-Mouret, CH;
Viktor Weiss, Fribourg, CH;
Ciba Geigy AG, Basel, CH;
Abstract
Compounds of the formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 independently of one another are hydrogen, alkyl or alkoxy and R.sub.2 additionally represents a radical of the formula ##STR2## in which R.sub.1 and R.sub.3 have the abovementioned meanings, R.sub.4 is unsubstituted or substituted phenoxy or unsubstituted or substituted amino and R.sub.5 is hydrogen or a radical of the formula ##STR3## in which R.sub.1, R.sub.3 and R.sub.4 have the abovementioned meanings and R.sub.2 ' has the same meanings as R.sub.1 and R.sub.3 are suitable development accelerators in the development of exposed, photographic materials containing silver halide. They accelerate the reduction of the exposed silver salt to silver and increase the speed of photographic material.