Canadian application, no grantCanada
Preparation of ether carboxylates
CA 2127776 A1 · Owner: Chadwick, Ruth Emma · Inventors: Chadwick, Ruth Emma; Phillips, Bryn Morris
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ether carboxylates are prepared by reacting a compound having a polyoxyalkylene chain with a water soluble salt of an unsaturated carboxylic acid in aqueous solution in the presence of a free radical initiator.
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 July 11, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 11, 1994
GrantedNo grant recorded
Term endedJuly 11, 2014
Patent numberCA 2127776 A1
Classification (IPC)C07C59/30 +2 more
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.