Bulky paper
CA 2481210 A1 · Owner: Nanri, Yasunori · Inventors: Ohashi, Reiji; Nakano, Tomoyuki; Nanri, Yasunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bulky paper which contains a polyacrylamide having a charge amount as measured at pH 2 of 2.0 meq/g or smaller and a charge amount as measured at pH 12 of 2.0 meq/g or smaller. It may optionally further contain amorphous silica or an amorphous silicate each having a bulk specific gravity of 0.3 g/mL or smaller as a filler and contain a bulking agent comprising a fatty acid polyamide compound or an ester of a polyhydric alcohol with a fatty acid. It may further contain a mercerized pulp or crosslinked pulp. The bulky paper containing the polyacrylamide has a relative bond area up to 1.2 times the relative bond area of a bulky paper containing no polyacrylamide. The bulky paper has …
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 26, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2025.
- 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.