Derivatives of 6,8-difluoro-7-hydroxycoumarin
CA 2219648 C · Owner: Molecular Probes, Inc. · Inventors: Haugland, Richard P.; Sun, Wei-Chuan; Gee, Kyle R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula , wherein R3 is H C1-C18 alkyl, C1-C18 perfluoroalkyl, CN formyl, aryl, heteroaryl, arylcarbonyl or -(C=O)-NR1R2 where R1 and R2 are independently H C1-C6 alkyl, aryl, or R1 and R2 taken in combination are -(CH2)2-M-(CH2)2- where M is a single bond -O-, -CH2-, or - NR6-, where R6 is H or C1-C6 alkyl; or R3 is -L-RX or -L-SC; R4 is H OH, CN, C1-C18 alkyl, C1-C18 perfluoroalkyl sulfomethyl, biologically compatible salt of sulfomethyl halomethyl, aryl, -L-R X or -L-S C; R5 is H or C1-C6 alkoxy; R7 is H or a monovalent moiety derived by removal of a hydroxy group from a phosphate a thiophosphate, a sulfate, or a biologically compatible salt thereof; or a monovalent …
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 October 28, 1997 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2019.
- 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.