Hydrocarbon oil compositions
CA 2047604 C · Owner: Drent, Eit · Inventors: Tomassen, Henricus P. M.; Drent, Eit; Reynhout, Marinus J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hydrocarbon oil compositions which contain as additive a polymer of carbon monoxide and one or more C10+ .alpha.-olefins in which the units originating from carbon monoxide and the units originating from the olefin(s) occur in a substantially alternating way show an, improved pour point, cold filter plugging point and/or cloud point.
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 July 23, 1991 and granted December 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 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.
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.