http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-768401-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_885561a91b4cb4e6a814f2d29c784977 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-42 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C5-39 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C5-39 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-42 |
| filingDate | 1955-01-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_45169bee421692fc4f09f860048bba03 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3e185ffb3012a0573f5d1cd02407563e |
| publicationDate | 1957-02-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-768401-A |
| titleOfInvention | Improvements in or relating to simultaneously developing and fixing or stabilizing photographic silver halide emulsions |
| abstract | 768,401. Simultaneously developing and fixing or stabilizing photographic silver halide emulsions. LEONAR-WERKE AKTGES. Jan. 31, 1955, No. 2884/55. Class 98(2) For single-step processing following exposure in a camera, enlarger copying device the emulsions are contacted with a solution containing a reducing agent, producing a colourless or only faintly coloured oxidation product together with hypo or thiourea and usually sodium sulphite. Antifogging agents such as nitrobenzimidazole or mercaptobenthiazole may be included in the solution. Processing may be effected under acid, neutral or alkaline conditions, and in the, latter case image degradation may be restricted, by the presence of difficultly soluble alkali binding substances or slow oxidizing agents present in the emulsion or in an intermediate or backing layer. In Example I a hard silver chlorobromide emulsion on 'paper or film base is exposed and treated for 30 seconds to one minute in a solution containing sodium hydrosulphite, sodium sulphite and hypo or thiourea-and then dried to produce a durable picture. In Example II the solution contains titanous chloride, potassium oxalate, or sodium citrate and thiourea, to produce a reddish-brown image in-half a minute. In Example III photographic base paper is impregnated with a solution of benzoic acid in alcohol, coated with emulsion, exposed in an enlarger and treated as by use of a sponge or roller for 10 to 20 seconds with a solution containing cautic soda, sodium sulphite, hydrazinc sulphate, hypo and nitrobenzimidazole. Example IV specifies a salicyclic acid-collodion layer for neutralization and -hydroxylamine in the developing solution, and Example V a gelatine-benzaldehydebiulphite neutralizing layer for similar procedure. In Example VI zinc oxalate as neutralizing agent and hydroxyamine hydrochloride as developer are included in the silver halide emulsion, and the processing liquid contains caustic potash, sodium sulphite, hypo and mercaptobenzthiazole. Example VII describes base paper coated with baryta containing also barium chromate and barium iodate and then with emulsion for exposure and processing as in Examples III or IV. A difficultly soluble acid also may be included in the base paper. Numerous other substances for neutralizing residual alkali are referred to in the Specification. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3337405-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-100467633-C http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3293036-A |
| priorityDate | 1955-01-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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