2-arylbenzazole compounds
CA 2213737 C · Owner: Cancer Research Ventures Limited · Inventors: Bradshaw, Tracey Dawn; Stevens, Malcolm Francis Graham; Shi, Dong-Fang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are disclosed herein 2-phenylbenzazole compounds having a 3'-substituent and a 4'-NR5R6 substituent in the phenyl group where R5 and R6 are each hydrogen or alkyl or where the, 4'-NR5R6 substituent is N-acyl (or N-benzoyl). There are also disclosed 2-phenylbenzazole compounds in the form of 4'-N sulphamate salts. Such compounds exhibit significant selective cytotoxic activity in respect of tumor cells and provide potentially useful chemotherapeutic agents for selective treatment of a range of cancers. The compounds have the general formula I: (see formula I)
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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 February 28, 1996 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2018.
- 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.