Quaternary isoquinoline derivatives
CA 1075241 A · Owner: Wellcome Foundation Limited (The) · Inventors: Dhar, Nirmal C.; Stenlake, John B.; Urwin, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I):, wherein Z1 and Z2 are the same or different and each represents a methylenedioxy substituent or up to three, methoxy substituents;, R2 and R3 are the same or different and each is alkyl having 1-3 carbon atoms, prop-2-enyl or prop-2-ynyl; R4 and R5 are the same or different and each is a benzyl or phenethyl group wherein the phenyl ring is optionally substituted by one or more of halogen alkoxy, having 1 to 3 carbon atoms and methylenedioxy; A and B are the same or different and each is an alkylene radical containing 1,2, or 3 carbon atoms; L is an alkylene chain having form 2 to 12 carbon atoms or is a group -L1.O.L2- wherein each of L1 and L2 is alkylene having …
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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
- Granted April 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 8, 1997.
- 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.