Infrared sensitizing dye for photographic element
CA 2024979 A1 · Owner: Parton, Richard L. · Inventors: Parton, Richard L.; Muenter, Annabel A.; Parton, Richard L.
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 photographic element is described comprising a support having thereon a silver halide emulsion layer comprising silver halide sensitized with a dye of the formula:, wherein L1 L2, L3, L4, L5, L6, L7, L8, and L9 each independently represents a substituted or unsubstituted methine group Z1 represents the atoms necessary to complete a benzothiazole nucleus, a benzoxazole nucleus a, benzoselenazole nucleus, a benzotellurazole nucleus or a benzimidazole nucleus, which, in addition to being substituted by -SR3, is further substituted or unsubstituted, Z2 represents the atoms necessary to complete a substituted or unsubstituted 5- or 6-membered heterocyclic ring, R1 …
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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
- Filed September 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2012.
- 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.