A process for including a fine particulate filler into tissue paper using an anionic polyelectrolyte
CA 2250842 A1 · Owner: Georgia Tech Research Corporation · Inventors: Deason, Howard Thomas; Vinson, Kenneth Douglas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for incorporating a fine non-cellulosic particulate filler into a creped tissue paper comprises the steps of: a) contacting an aqueous dispersion of a non-cellulosic particulate filler (34) with an aqueous dispersion of an anionic polyelectrolyte polymer (35); b) mixing the aqueous dispersion of polymer-contacted filler (38) with papermaking fibers forming an aqueous papermaking furnish (41) comprising polymer-contacted filler and papermaking fibers; c) contacting said aqueous papermaking furnish (41) with a cationic retention aid (46); d) forming an embryonic paper web (88) from the aqueous papermaking furnish (45) on foraminous papermaking clothing (85); e) removing …
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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 April 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 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
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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.