Zwitterionic imides
CA 2463290 A1 · Owner: Hamrock, Steven J. · Inventors: Hamrock, Steven J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Zwitterionic imide compounds are provided according to the formula: R1-SO2-N-- SO2-R2+, where R1 and R2+ are any suitable groups. Typically R1 is a highly fluorinated alkane and R2+ contains a quaternary ammonium group or a heteroatomic aromatic group having an cationic nitrogen such as: , pyridiniumyl, pyridaziniumyl pyrimidiniumyl, pyraziniumyl, imidazoliumyl pyrazoliumyl, thiazoliumyl, oxazoliumyl or triazoliumyl. Zwitterionic liquids are provided, typically having melting points of less than 100 ~C and typically having a solubility in water of less than 5% by weight.
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 August 2, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 2, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2024.
- 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.