Application of a layer of admixture in the web former unit of a board machine
CA 2320199 A1 · Owner: Kinnunen, Juha S. · Inventors: Korhonen, Hannu; Viertola, Mika; Kinnunen, Juha S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for application of a layer of admixture in the web former unit of a board machine. The flow of fresh stock (11) is divided into at least two component stock flows (121 and 122) of which flows, to at , least one component flow (121) which forms a face which will be placed against the face of the layer to be combined with it at a point (141) before , the pump (22) at a point (14a2), and/or at a point (143) after the machine screen, admixtures are added in order to increase the contents of fines in the layers and the bonding strength between the faces and after this the , component flows (121 and 122) are passed into the multi-layer headbox (44) and …
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 February 3, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 2021.
- 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.