Infra-red sensitive photographic materials
CA 2045902 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Burrows, Ronald W.; Hall, Kevin P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Infra-red Sensitive Photographic Materials Cyanine dyes are disclosed having a nucleus of the formula:, (I), wherein;, A and B are independently selected from the group consisting of heterocyclic ring nuclei and heterocyclic fused ring nuclei so as to complete a cyanine dye m and n independently have values of 0 1, 2 or 3, with the proviso that 2 ? m + n ? 4 R is selected from the group consisting of hydrogen alkyl groups and aryl groups, each of which groups may be substituted, and, Q represents those non-metallic atoms necessary to complete a nucleus selected from the group consisting of heterocyclic ring nuclei, carbocyclic ring nuclei heterocyclic fused ring nuclei and carbocyclic fused …
Read the whole patent
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 June 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2013.
- 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.