Zeolite dispersion
CA 2250237 A1 · Owner: Dahlgren, Maj-Lis · Inventors: Lindahl, Lars; Wildlock, Ylva; Dahlgren, Maj-Lis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous dispersion comprising particles of a zeolite having a hydrophobicity of below about 0.9 percent by weight residual butanol as determined by the Residual Butanol Test which dispersion comprises a , stabilising amount of a biogum. Production of the dispersion comprising mixing zeolite particles with a biogum into a dry mixture; and mixing the dry mixture with water under agitation into a homogeneous mixture. Use of the dispersion for binding particles of zeolite to fibres. Production of paper or paperboard by forming and dewatering a suspension of cellulosic fibres wherein dewatering is carried out in the presence of particles of a zeolite the dispersion being , added to the …
Read the whole patent
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.