Method in drying of paper
CA 2391778 A1 · Owner: Zhang, Xiaojing · Inventors: Persson, Ulf; Backa, Stefan; Andren, Anders
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method in consolidation and drying of paper. A wet web (2) is contacted with superheated steam, whose temperature is 200-600 ~C for the purpose of , reducing, by heat transfer from the superheated steam the water content of , the web (2) by evaporation of a substantial part of the water in the same. The wet web (2) is supported and transported by means of a heat-conductive gas-, impermeable belt (4) whose width is equal to or exceeds the width of the web and jets of the superheated steam are directed towards the side of the web (2) facing away from the belt (4).
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 November 9, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2022.
- 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.