Thienoimidazole derivatives, their production and use
CA 2054465 A1 · Owner: Inada, Yoshiyuki · Inventors: Naka, Takehiko; Inada, Yoshiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Benzimidazole derivatives of the formula (I): (I), wherein the ring A is a thiophene ring which may optionally contain substitution in addition to the R3 group; R1 is hydrogen or optionally substituted hydrocarbon residue which may be bonded through a hetero atom; R2 and R3 are independently a group capable of forming an anion or a group convertible thereinto; X is a direct bond or a spacer having an atomic length of two or less between the phenylene group and the phenyl group; and n is an integer of 1 or 2; or a salt thereof, have potent angiotensin II antagonistic activity and antihypertensive activity thus being useful as therapeutic agents for treating circulatory system diseases such …
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 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2013.
- 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.