Benzothiadiazine derivative
CA 2109723 C · Owner: Yamamoto, Noriyuki · Inventors: Kajitani, Makoto; Yamamoto, Noriyuki; Yano, Shingo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A benzothiadiazine derivative, a hydrate thereof and acid addition salt thereof, the derivative being represented by the formula, (see fig. I) wherein: X is methylene or a nitrogen atom substituted with a lower alkyl; Y and Z are each methylene or carbonyl; A is phenylene or phenylene substituted with methoxycarbonyl; B is lower alkylene or lower alkenylene; R1 is a hydrogen atom, acetoxyacetyl, cyclohexylmethyl or benzyl wherein the benzene ring may be substituted with lower alkoxyl halogen, atom, nitro, lower alkyl, methylenedioxy or hydroxyl; R2 is lower alkyl or phenyl; and R3 is a hydrogen atom halogen, atom or lower alkoxyl; provided that in the case where X Y, and Z are each …
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 May 22, 1992 and granted July 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2014.
- 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.