http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-658826-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-09 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-09 |
| filingDate | 1949-05-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1951-10-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-658826-A |
| titleOfInvention | Improvements in or relating to photographic emulsions |
| abstract | 658,826. Photographic emulsions. DU PONT DE NEMOURS & CO., E. I. May 19, 1949, No. 13431. Convention date, May 19, 1948. [Class 98 (ii)] A colloid silver halide emulsion contains a sulphur sensitizer, which may, in the case of gelatine, be a naturally occurring sulphur sensitizer or which may be an added compound such as sodium thiosulphate, allyl isothiocyanate, thiourea, or an N-substituted thiourea, and a small amount of gold and iron and optionally a small amount of mercury. 0.0000723 to 0.000288 mol. per cent of gold, 0.011 mol. per cent of iron, and 0.000108 to 0.000162 mol. per cent of mercury may be used, based on the silver content of the emulsion. The emulsion binder may be gelatine, agaragar, a polyglycuronic acid, zein, collodion, a water-soluble cellulose derivative (e.g. substantially hydrolysed cellulose acetate, a cellulose ester of a hydroxymonocarboxylic acid such as lactic or glycollic acid, or an alkali metal salt of a cellulose ester of a dicarboxylic acid such as phthalic acid), polyvinyl alcohol, a partially hydrolysed polyvinyl acetate or an interpolymer thereof with an unsaturated compound such as styrene or maleic acid, or a water-soluble polyvinyl acetal. In example (1), various additions of sodium thiosulphate, chlorauric acid, ferric nitrate, and mercuric chloride are made to a silver iodobromide emulsion having an inert gelatine binder and sensitized with 3 : 3<SP>1</SP> - diethyl-9-methylthiocarbocyanine iodide. The relative speed, gamma, and fog values are compared, and similar data are given for an emulsion aged at 120‹ F. for one week. In example (2), the effect of ferric nitrate is compared with that of ferrous sulphate, sodium thiosulphate and chlorauric acid being present in both cases. Specifications 527,283, 542,703, 542,704, 551,659, 570,393, 636,140, 636,234, and U.S.A. Specifications 2,059,642, 2,110,491, and 2,211,323 are referred to. |
| priorityDate | 1948-05-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 50.