Method for separating lignin from a lignin containing liquid/slurry
CA 2580834 C · Owner: Oehman, Fredrik · Inventors: Norgren, Magnus; Theliander, Hans; Tomani, Per
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 for precipitating (separation) of lignin, using small amounts of acidifying agents whereby a lignin product or , an intermediate lignin product is obtained which can be used as fuel or chemical feed stock (or as a chemical or a raw material for further refining) from a lignin containing liquid/slurry such as black liquor. The present , invention also provides a method for separation of lignin from a lignin containing liquid/slurry, such as black liquor whereby a more pure lignin is , obtained. The present invention also provides a lignin product or an intermediate lignin product obtainable by the above methods. The present invention also provides …
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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 October 3, 2005 and granted October 1, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 3, 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
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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.