Dendrimeric polymers for the production of paper and board
CA 2292520 A1 · Owner: Polverari, Marco Savio · Inventors: Polverari, Marco Savio; Allen, Lawrence Harvey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A papermaking stock and a method for improving the retention of pulp fines mineral fillers, dispersed wood resin, and/or synthetic hydrophobic stickies and cellulose fibers in a cellulosic fiber sheet employs dendrimeric polymers , for increasing the retention of fines fillers, dispersed hydrophobic , particles and cellulosic fibers. The application in the paper industry provides a means of (1) increasing the retention of fillers in paper and decreasing the loss of filler materials in white water waste from papermaking; (2) increasing the retention of cellulosic fines and fibers in the papermaking process; increasing drainage on the paper machine; and (3) removing a significant …
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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 May 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2020.
- 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.