Alkylated oxidized lignins as surfactants
CA 1270815 C · Owner: Texaco Development Corporation · Inventors: Morrow, Lawrence Robert; Dague, Michael Garrison; Whittington, Lawrence Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a method of producing surfactants from lignin which comprises subjecting lignin to two reactions alkylation with an alkyl chain having about 3 to about 24 carbon atoms at phenolic sites, and oxidation sufficient to break the lignin into smaller polymeric and monomeric units. The invention also includes using these lignin surfactants in surfactant floods for enhanced oil recovery.
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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
- Granted June 26, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 26, 2007.
- 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.