Proline derivatives
CA 1253297 A · Owner: Imperial Chemical Industries Plc · Inventors: Dutta, Anand S.; Stein, Ross L.; Wildonger, Richard A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Proline derivatives of the formulae: (I), (II), (III), wherein R1 through R11 have defined values and acid- and, base-addition salts thereof and equilibrium addition compounds, of the aldehyde group thereof; processes for their preparation; pharmaceutical compositions; and intermediates for preparing said proline derivatives. The proline derivatives are human leukocyte elastase inhibitors which are useful for example, in, treating pulmonary emphysema.
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 April 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2006.
- 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.