Silver halide photographic material containing n-amino substituted thiourea derivatives as stabilizing agents
CA 1138245 A · Owner: Agfa-Gevaert Aktiengesellschaft · Inventors: Sommer, Friedhelm; Wernicke, Ubbo; Odenwlder, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1 -, PHOTOGRAPHIC MATERIAL WITH STABILIZERS (Abstract of the Disclosure), Thiocarbohydrazide derivatives act as stabilizers when processing photographic materials in the conventional black and white developers of the type used as first developer in colour reversal processes. Furthermore they can promote, the development of colour in the second developer in colour reversal processes in such a way that a second exposure or fogging baths may be dispensed. A-G 1567
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.