Expired Canadian patentCanada
Intermediates useful for the preparation of n-substituted carbamoyloxyalkyl-azolium derivatives
CA 2680292 C · Owner: Hayase, Tadakatsu · Inventors: Hayase, Tadakatsu; Fukuda, Hiroshi; Ohwada, Jun
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Intermediates useful for the preparation of n-substituted carbamoyloxyalkyl- azolium derivatives are described. Examples of such intermediates are compounds of formua IV (see formula IV)
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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 October 25, 2000 and granted November 27, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 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.
FiledOctober 25, 2000
GrantedNovember 27, 2012
Term endedOctober 25, 2020
Patent numberCA 2680292 C
Classification (IPC)C07D213/75
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.