Ionic liquids
CA 2483829 A1 · Owner: Richter, Frank · Inventors: Halpaap, Reinhard; Richter, Frank; Koecher, Juergen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to novel ionic liquids of general formula (I): in which A- represents an optionally substituted and/or anellated five-membered nitrogen heteroaromatic, whose ring nitrogen has been deprotonated E , represents a nitrogen or phosphor atom R1, R2, R3 and R4 represent identical or different groups and respectively a saturated or unsaturated aliphatic or cycloaliphatic group, an optionally substituted aromatic or araliphatic group which contains up to 24 carbon atoms and optionally up to 3 heteroatoms selected from the series oxygen, sulphur and nitrogen and which can be optionally substituted by halogen atoms with the proviso that at least one of the groups R1 to R4 …
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 April 17, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2025.
- 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.