Expired Canadian patentCanada
Terpolymers of ethylene, their preparation and their use as additives for mineral oil distillates
CA 2057464 C · Owner: Reimann, Werner · Inventors: Feustel, Michael; Reimann, Werner; Hobes, John
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 invention relates to terpolymers obtained by joint polymerization of ethylene, vinyl acetate and vinyl neononanoate or vinyl neodecanoate, a process for their preparation and their use as additives for mineral oil distillates.
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 December 20, 1991 and granted February 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 20, 1991
GrantedFebruary 4, 1997
Term endedDecember 20, 2011
Patent numberCA 2057464 C
Classification (IPC)C08F210/02 +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.