Esters of 1,4-ethano-10-hydroxy-5-oxo-5h-1 benzopyrano 3,4-b pyridine
CA 1095519 A · Owner: Abbott Laboratories · Inventors: Arendsen, David L.; Zaugg, Harold E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are compounds of the formula useful in reducing the intra-ocular pressure in mammalian patients wherein R is a straight or branched chain alkanoyl group having from 2-8 carbon atoms or with Y being a straight or branched chain alkylene group having from 1-8 carbon atoms; a is an integer from 1-4; b is an integer from 1-4; X is CH2, O, S or NR1 with R1, being hydrogen or lower alkyl with the limitation that when X is O, S, or NR1, the sum of a and b is 3 or 4 and, pharmaceutically acceptable acid addition salts thereof.
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 February 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 10, 1998.
- 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.