Copolymer compositions comprising a copolymer and one or more lubricating additives
CA 2104334 A1 · Owner: Shell Canada Limited · Inventors: Kormelink, Hendrik G.; Kramer, Arie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copolymer compositions comprising a copolymer of carbon monoxide and one or more ethylenically unsaturated compounds and less than 10 %w, based on the weight of the composition of one or, more external lubricating additives having an average molecular weight of at least 500 and selected from oxidized polyolefins and copolymers of olefins and unsaturated esters.
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 August 18, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2015.
- 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.