Infrared-sensitive photographic element containing at least two photosensitive layers
CA 2024980 A1 · Owner: Parton, Richard L. · Inventors: Parton, Richard L.; Adin, Anthony; Muenter, Annabel A.
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) a silver halide emulsion layer where the silver halide is sensitized with a dye having the formula:, wherein, Z1 and Z2 each independently represents the atoms necessary to complete a substituted or unsubstituted 5- or 6-membered heterocyclic nucleus R1 and R2 each independently represents substituted or unsubstituted alkyl or substituted or unsubstituted aryl, and, R3, R4, R5, and R6 each independently represents hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, X represents a counterion, and, (b) at least one other red- or infrared-sensitive silver halide …
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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.