Photographic material containing oxazolinone-2 couplers, oxazolinone-2 compounds and process for their preparation
CA 1081702 A · Owner: Agfa-Gevaert Aktiengesellschaft · Inventors: Meier, Ernst; Schranz, Karl-Wilhelm; Credner, Hans H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a novel process for the production of photographic images by the exposure and development of a light-sensitive photographic material containing at least one light-sensitive silver halide emulsion layer with an aromatic colour developer compound containing primary amino groups in the presence of an oxaxolinone-2 compound which is monosubstituted or disubstituted in the 4- and/or 5- position by a substituent, or substituents which does not or do not interfere with the coupling of the oxazolinone-2 ring with the oxidized colour developer and which does not or do not split off during the coupling reaction the oxazolinone-2 being pre-, sent in any of its tautomeric …
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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 July 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 1997.
- 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
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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.