Amine-unsaturated acid adducts as asphaltene dispersants in crude oil
CA 2424910 A1 · Owner: Mukkamala, Ravindranath · Inventors: Mukkamala, Ravindranath
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition comprising: (a) 0.001% to 5% of at least one compound of formula (I), or a zwitterionic form or salt thereof wherein R1 is C10-C22 alkyl or , aralkyl; R2 and R3 independently are hydrogen or C1-C4 alkyl; R4 is hydrogen C1-C22 , alkyl, C7-C22 aralkyl, or -CH(R5)CH(R6)COOH wherein R5 and R6 independently are, hydrogen or C1-C4 alkyl; and (b) crude oil.
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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 April 9, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2025.
- 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.