Terpolymers of ethylene, their preparation and their use as additives for mineral oil distillates
CA 2204945 A1 · Owner: Reimann, Werner · Inventors: Krull, Matthias; Reimann, Werner
Overview
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 copolymerization of ethylene, the vinyl ester of one or more aliphatic monocarboxylic acids containing from 2 to 20 carbon atoms in the molecule and, bicyclo2.2.1hept-2-ene (also referred to as norbornene) or its derivatives, a process for their preparation and their use as additives for mineral oils and 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 May 9, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.