Pyridine derivatives
CA 1134828 A · Owner: Kissei Pharmaceutical Co. Ltd. · Inventors: Kawamura, Masanori; Hayashi, Masaki; Tanouchi, Tadao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The pyridine derivatives of the general formula: I, wherein A represents an alkylene group containing from 1 to 5 carbon atoms, B represents a single bond or an oxygen or sulphur, atom, or an alkylene group containing from 1 to 5 carbon atoms D represents a single bond, or an alkylene group containing from 1 to 5 carbon atom, E represents a grouping of the formula: or , (in which R6 represents a hydrogen atom or an akyl group con-, taining from 1 to 4 carbon atoms) Z represents a single bond, or an ethynylene group or a grouping of the formula: , in which R2 represents a hydrogen atom or an alkyl group con-, taining from 1 to 4 carbon atoms R3 represents a hydrogen, bromine, or chlorine …
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
- Granted November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 1999.
- 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.