Asphaltene inhibition
CA 2584787 C · Owner: The Lubrizol Corporation · Inventors: Davies, Mark C.; Wilkes, Mark F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method of asphaltene control in a hydrocarbon fluid, the method employing a composition comprising: a dispersant of formulae (I) or (II), including salts thereof, wherein T or T' is hydrogen or a polymerizing terminating group; A is C16-20 alkylene or alkenylene group; B is C10-20 alkylene or alkenylene group; Z and Z' are the residue of a polyamine or polyimine; n is 2 to 50; m is 0 to 25; p and p' are 2 or more in one , embodiment not greater than 2000 and in another embodiment not greater than 1000; A' is C8-20 alkylene or alkenylene group; n' is 2 to 10; and the weight ratio of T-(O-A-CO)n (O-B-CO)m to Z or T'-(O-A'-CO)n to Z' is at least 5:1.
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 October 26, 2005 and granted January 22, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 26, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.