N-substituted homophthalimide 4-thioether derivative as development inhibitor releasing compounds
CA 1079564 A · Owner: Agfa-Gevaert Aktiengesellschaft · Inventors: Odenwalder, Heinrich; Puschel, Walter; Ranz, Erwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A color photographic material having a silver halide emulsion layer and containing a thioether compound which is reactable on chromogenic development thereby releasing a diffusible substance which inhibits the development of the silver halide. The thioether compound is a homophthalimide containing a removable mercapto group containing moiety in the 4-position and its nitrogen in the 2-position atom being a tertiary nitrogen.
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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 June 17, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 17, 1997.
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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.