Expired Canadian patentCanada
Surface-active agent
CA 1082732 A · Owner: Exxon Research And Engineering Company · Inventors: Tirtiaux, Robert; Prillieux, Marcel; Marin, Pierre D.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Surface active agents for oil in watcr emulsions and oil recovery comprising salts of alkaryl sulphonic acids and organic bases containing at least one -(C2H4O)nH where n is greater than 1.
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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 July 29, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 16, 1976
GrantedJuly 29, 1980
Term endedJuly 29, 1997
Patent numberCA 1082732 A
Classification (IPC)C08L71/02 +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.