Expired Canadian patentCanada
Process for preparing mono-n-alkylated polyazamacrocycles
CA 2006358 C · Owner: The Dow Chemical Company · Inventors: Kruper, William J. Jr.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a novel process to prepare selectively mono-N-alkylated polyazamacrocycles which requies a electrophile with between one and five equivalents of a suitable macrocycle in a solvent which will not promote a proton transfer.
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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 December 21, 1989 and granted July 7, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 21, 1989
GrantedJuly 7, 1998
Term endedDecember 21, 2009
Patent numberCA 2006358 C
Classification (IPC)C07D255/02 +2 more
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.