Drag-reducing polymers and drag-reducing polymer suspensions and solutions
CA 2429939 C · Owner: Lubrizol Specialty Products, Inc. · Inventors: Milligan, Stuart; Smith, Kenneth W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drag-reducing polymer is described, along with a method for manufacturing the drag-reducing polymer. The drag-reducing polymer is manufactured by bulk polymerizing a vinyl aromatic with an .alpha.-olefin wherein the .alpha.-, olefin has a carbon chain length of between two and twenty carbons. A dragreducing polymer suspension and drag-reducing polymer solution are also described.
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 November 27, 2001 and granted April 26, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2023.
- 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.