http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-262531-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ea381884f3a91e7c1aea24fa93b1d70b http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_72752a089426a971ae0bdde7a37842e2 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03F7-14 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03F7-14 |
| filingDate | 1925-09-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1926-12-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-262531-A |
| titleOfInvention | Improvements in or relating to photo mechanical processes of printing |
| abstract | 262,531. Eldridge, E. B., and Haeseler, J. A. Sept. 15, 1925. Photo-mechanical printing-surfaces; developing.-To obtain grainless collotype printing-surfaces from silver images, an ordinary plate or emulsion is developed with a developer whose action is so feeble or restricted as to produce an extremely faint or tenuous image, before being fixed and treated with the bichromate or like hardening bath. A developer (e.g. amidol) diluted from 12 to 20 times the strength ordinarily employed may be employed and a hardening bath composed of copper sulphate, potassium bromide, potassium bichromate, and chromic acid. The bleached silver image may be dissolved out or left in. Copper chloride and sodium chloride may be substituted for the copper sulphate. The treated image may, if necessary, be further hardened by a weak chrome alum or other bath. The process may be applied to kinematograph films, for printing copies thereof, or to enlarged positives which can be exposed through a. reversed negative. |
| priorityDate | 1925-09-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.