Ion-sensitive compounds
CA 2136017 A1 · Owner: Fletcher, Nicholas C. · Inventors: Beer, Paul D.; Goulden, Alistair J.; Moore, Christopher P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ion-sensitive Compounds, Abstract, An ion-sensitive compound has the formula A2+B2- wherein A represents a cation capable of forming a receptor-substrate complex with an anion and B represents one or more counter anions characterised in that the cation is an anion receptor represented by the formula, or, -13-, wherein R1, R2, R3 and R4 are each independently hydrogen, a substituted or unsubstituted alkyl group a substituted or unsubstituted aryl group an, alkylamido group, an arylamido group an, alkylsulfonamido group, an arylsulfonamido group or a nitro group;, R5 and R6 are each independently H or a lower alkyl group having from 1 to 4 carbon atoms or, R5 and R6 taken together represent …
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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 April 18, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 2016.
- 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.