Substituted phthalocyanines and their precursors
CA 2394891 A1 · Owner: Heeney, Martin James · Inventors: Cook, Michael John; Heeney, Martin James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for the preparation of phthalonitrile sulfonate esters, a process for the preparation of substituted phthalonitriles using said phthalonitrile sulfonate esters a process for the preparation of , substituted phthalocyanines using said substituted phthalonitriles a process , for the preparation of phthalonitrile halides a process for the preparation , of substituted phthalocyanines using said phthalonitrile halides novel , phthalonitrile sulfonate esters novel substituted phthalonitriles, novel substituted phthalocyanines and certain uses of said novel substituted phthalocyanines.
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 December 8, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2022.
- 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.