Silver halide photographic materials
CA 1332030 C · Owner: Yagihara, Morio · Inventors: Yagihara, Morio; Okada, Hisashi; Katoh, Kazunobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A super-high contrast negative type silver halide photographic material is disclosed, comprising a support having thereon at least one silver halide emulsion layer said emulsion layer or layers or other hydrophilic colloid layer or layers containing at least one compound selected from hydrazine derivatives represented by formula (I) and, at least one compound selected from compounds represented by formula (II);, (I), wherein A1 and A2 both represent hydrogen atoms or one represents a hydrogen atom and the other represents a sulfinic acid residual group or an acyl group Ra represents an, aliphatic group, aromatic group or heterocyclic group Rb, represents a hydrogen atom, alkyl group aryl …
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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 September 20, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 20, 2011.
- 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.