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:
Jun. 16, 1992
Filed:
Mar. 13, 1991
Marc H Van Bockstaele, Mortsel, BE;
Marc B Graindourze, Overpelt, BE;
Jean-Marie O Dewanckele, Drongen, BE;
AGFA-Gevaert, N.V., Mortsel, BE;
Abstract
A halogen acceptor according to general chemical formula (I) is added to a photographic negative roomlight emulsion, consisting of at least 90% of silver chloride, having an average grain size smaller than 0.3 micron, and internally doped with an element of group VIII of the periodic table. ##STR1## In this formula: R.sup.1 =alkyl having at least 4 C-atoms, preferably between 4 and 9. In the coated emulsion layer, the halogen acceptors of the invention provide a clear print-out effect and an improved development latitude when the emulsion layer is developed in a 'hard-dot Rapid Access' processing system. In a preferred embodiment R=--C.sub.6 H.sub.13 and the element of group VIII is Rhodium.