Canadian application, no grantCanada
Treatment of organic sulfonic acid
CA 2072202 A1 · Owner: The Lubrizol Corporation · Inventors: Westfall, David L.; Schnur, Eric R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention describes treating an organic sulfonic acid with an olefin to obtain an improvement in color of the resultant salts and to lessen the amount of inactive components in the composition. 2581.dkt
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 June 24, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 24, 1992
GrantedNo grant recorded
Term endedJune 24, 2012
Patent numberCA 2072202 A1
Classification (IPC)C07C309/31 +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.