A therapeutic agent for renal disease
CA 2245896 C · Owner: Yao, Kozo · Inventors: Nonaka, Hiromi; Takai, Haruki; Karasawa, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A therapeutic agent for kidney diseases which comprises as the active ingredient a quinazoline derivative represented by general formula (I) or a pharmacologically acceptable salt thereof wherein R1 represents hydrogen, lower alkyl alkenyl, aralkyl, etc.; R2, R3, R4, and R5 may be the same or different and each represents hydrogen lower alkyl, lower alkoxy, lower , alkanoyl etc.; R6, R7, R8, and R9 may be the same or different and each represents hydrogen, lower alkyl, lower alkoxy aralkyloxy, lower alkanoyloxy, etc. or adjacent two of these may be bonded to each other to thereby form methylenedioxy, etc.; R10 represents hydrogen lower alkyl, etc.; R11 and R12 , may be the same or …
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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 19, 1997 and granted June 10, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 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.