Asphaltene inhibitors
CA 2386721 A1 · Owner: Groffe, Didier · Inventors: Breuer, Wolfgang; Herold, Claus-Peter; Lesimple, Alain
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described are compositions for preventing the precipitation of asphaltenes in crude oils or for removing solid asphaltene residues from the surface of production plants or the petroleum-containing formation surrounding the well in the production and refining of petroleum where the compositions comprise: , a) alkylarylsulphonic acids and b) condensation products of fatty acids having from 12 to 24 carbon atoms and polyamines of the general formula (I): H2N- (CH2)n-NHn-R1, in which R1 is hydrogen a methyl, ethyl, hydroxyethyl or a -, (CH2)n-NH-R2 group R2 is hydrogen, a methyl, ethyl or hydroxyethyl group and , n is a number between 1 and 4, and m stands for numbers from 1 to 6 and c) , …
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 September 30, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2022.
- 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.