Expired Canadian patentCanada
Nitrogenous copolymers, their preparation and uses as flow characteristics enhancement additives for middle hydrocarbon distillates
CA 1313668 C · Owner: Elf France · Inventors: Denis, Jacques; Damin, Bernard; Leger, Robert
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
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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 February 16, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 16, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 31, 1988
GrantedFebruary 16, 1993
Term endedFebruary 16, 2010
Patent numberCA 1313668 C
Classification (IPC)C08F226/06 +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.