Method of making coated or impregnated paper or paperboard
CA 2256744 A1 · Owner: Rousseau, Stephane · Inventors: Rousseau, Stephane; Koutitonsky, Serge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for making a surface coated or impregnated paper or paperboard by applying an aqueous additive dispersion to the wet web between the press and drying sections of a conventional paper or paperboard making machine. The aqueous additive dispersion is premetered onto a transfer roll and is applied to the wet web at a pressure nip between the transfer roll and a back-up roll. High solids content dispersions can be applied at high web speeds without tearing the web. The use of a high solids content aqueous dispersion having a solids content substantially equal to the solids content of the wet web at the point of application permits the method to be performed without increasing …
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 June 5, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 5, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 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.