Roll and blade twin-wire gap former for a paper machine
CA 2277979 C · Owner: Valmet Corporation · Inventors: Verkasalo, Lauri; Odell, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A roll and blade gap former for a paper machine having first and second wires guided in a respective loop and defining a twin-wire forming zone a forming gap in which the first and second wires converge before the tiwn-wire zone a headbox including a slice channel having a slice opening through which a stock suspension jet is fed into the forming gap to form a web between the wires and drainage and forming elements arranged in the twin-wire zone for removing water from the web. To provide an improvement in the control of the Z-direction properties of the web the former includes turbulence generating vanes arranged in the slice channel in the headbox cause turbulence in the stock suspension …
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 10, 1997 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 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.