Absorbent cellulosic material and production thereof
CA 2240129 A1 · Owner: Eka Chemicals Ab · Inventors: Malmborg, Kerstin; Wahlen, Svante; Thebrin, Ingemar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method in which a sheet of cellulosic fibres is shredded into fluff wherein prior to shredding, the fibres are treated in the presence of water with a hydrophobic substance having a specific surface area of at least about 50m2/g to yield improved sorptive capacity; fluff obtainable by the method absorbent , articles comprising such fluff; use of a substance of said kind for improving the sorptive capacity of absorbent material comprising the fibres; a process for production of absorbent material obtained by shredding a sheet of such fibres in which the fibres, prior to shredding have been treated in the , presence of water with a substance of said kind to yield improved sorptive …
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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 March 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2019.
- 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.