http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-598403-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9799ffcda2dbb45041a5ab0fd08dd5fe |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S430-167 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S430-145 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C5-305 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-061 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C5-305 |
| filingDate | 1944-08-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1948-02-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-598403-A |
| titleOfInvention | Improvements in developers for photographic emulsions |
| abstract | 598,403. Photographic development. KODAK, Ltd. Aug. 28, 1944, No. 36776/46. Convention date, Aug. 26, 1943. Divided out of 598,108. [Class 98 (ii)] . The apparent speed or contrast or both of a silver halide emulsion is increased by development at a pH value of at least 9.5 in a phenolic non-coupling developing solution in which there has been incorporated hydrazine or a hydrazine derivative of the general formula RNH.NR2, wherein each R is either H or an organic group. The developing agent may be metol, catechol, hydroquinone or pyrogallol, and the incorporated compound hydrazine hydrate or dihydrochloride, ethyl hydrazine carbonate, 2- benzthiazolylhydrazine, 2 - quinolylhydrazine, 4 - hydrazinoquinaldine, 2 - pyridylhydrazine, p - hydroxyphenylhydrazine hydrochloride, asdimethylhydrazine hydrochloride, 2 : 4-dinitrophenylhydrazine, alpha-benzyl-alpha-phenytilhydrazine hydrochloride, p - nitrophenylhydrazine hydro - chloride, alpha-methyl-alpha-phenylhydrazine sulphate, N-acethydrazide pyridinium chloride, #-benzoylacethydrazidopyridium chloride, the compound prepared by adding ethyl chloracetate to 2- phenylpyrimidazole and then treating with hydrazine, malonyldihydrazide pyridinium bromide, # - phenylacethydrazidopyridinium chloride, malonic acid dihydrazide, aconitic acid trihydrazide, phenylsuccinic dihydrazide, oxalic acid dihydrazide, semicarbazide hydrochloride, carbohydrazide hydrochloride, acetcarbohydrazide pyridinium chloride, malonyl dicarbohydrazide pyridinium bromide, 4-(p-chlorophenyl) - semicarbazide, 4 - (o - tolyl) - semicar - bazide, 4 - (4<1> chloro - 2<1> - methylphenyl) - semi - carbazide, diaminobiuret, aminobiuret, N- methyl-2-carbohydrazide pyridinium p-toluenesulphonate, the acetone derivative of acetcarbohydrazide pyridinium chloride, the diacetyl derivative of N - acethydrazide pyridinium chloride, the glycose derivative of N-acethydrazide pyridinium chloride, and the acetone derivative of benzyldimethylacethydrazide ammonium chloride. With developers having a pH of 10 or more, the sulphite concentration may be high, but with developers of lower pH value the sulphite concentration should be less. Developers of pH 10.2 and 9.7 (containing hydrazine dihydrochloride and 6-nitrobenzimidazole nitrate) and a developer containing hydroquinone, caustic soda and hydrazine dihydrochloride are formulated. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1597490-A1 |
| priorityDate | 1943-08-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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