Pyridine derivatives
CA 2040747 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Roberts, David Anthony; Ratcliffe, Arnold Harry; Bradbury, Robert Hugh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns pharmaceutically useful novel compounds of the formula I, in which R1, R2, R3, R4, R5 R6, R7, X and Z have the, various meanings defined herein and their non-toxic salts, and, pharmaceutical compositions containing them. The novel compounds are of value in treating conditions such as hypertension and congestive heart failure. The invention further concerns processes for the manufacture of the novel compounds and the use of the compounds in medical treatment.
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 April 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 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.