EP 0445444 A1 19910911 - Photographic emulsions.
Title (en)
Photographic emulsions.
Title (de)
Photographische Emulsionen.
Title (fr)
Emulsions photographiques.
Publication
Application
Priority
GB 8821433 A 19880913
Abstract (en)
There is described a silver halide emulsion which comprises a colloid medium having dispersed therein silver halide emulsion crystals which comprise at least two layers of different silver halide composition, there being sub-developable silver centres present at the boundary between two of the layers which have been formed by a reduction process. By sub-developable centres is meant small clusters of silver atoms which increase the inherent light sensitivity of the silver halide grains but which do not contribute substantially to the formation of fog when unexposed silver halide crystals are developed.
IPC 1-7
IPC 8 full level
G03C 1/005 (2006.01); G03C 1/035 (2006.01); G03C 1/18 (2006.01)
CPC (source: EP)
G03C 1/0051 (2013.01); G03C 1/035 (2013.01); G03C 1/18 (2013.01); G03C 2001/0156 (2013.01); G03C 2001/03511 (2013.01); G03C 2001/03535 (2013.01); G03C 2200/44 (2013.01)
Citation (search report)
- [YD] FR 2169360 A1 19730907 - AGFA GEVAERT AG [DE]
- [Y] DE 2801127 A1 19790719 - AGFA GEVAERT AG
- [Y] DE 2402130 A1 19740801 - EASTMAN KODAK CO
- [X] PATENT ABSTRACTS OF JAPAN vol. 7, no. 26 (P-172)(1171) 02 February 1983, & JP-A-57 179835 (KONISHIROKU SHASHIN KOGYO K.K.) 05 November 1982,
Designated contracting state (EPC)
BE CH DE FR GB IT LI
DOCDB simple family (publication)
GB 2222694 A 19900314; GB 2222694 B 19920527; GB 8920532 D0 19891025; EP 0445444 A1 19910911; GB 8821433 D0 19881012
DOCDB simple family (application)
GB 8920532 A 19890911; EP 90302312 A 19900305; GB 8821433 A 19880913