Method for treatment of spent peroxide bleaching liquors
CA 1268907 C · Owner: Mo Och Domsjo Aktiebolag · Inventors: Lindahl, Jonas A.I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for treatment of spent peroxide bleaching liquors A B S T R A C T, Water glass is separated and recovered from waste liquors obtained when manufacturing and bleaching high yield pulps and waste-paper pulps, by adding to the waste liquor an inorganic compound containing a multi-valent cation and/or an organic flocculating agent, while simultaneously adjusting the pH of the waste liquor to a value between 3.5 and 7.5, preferably between 4.0 and 6Ø The silicate thus precipitated in the waste liquor is caused to settle to form a sediment, whereafter the sediment is separated and recovered and the waste liquor thus freed from silicate is returned to the process.
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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 May 15, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 15, 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.