Web forming method and apparatus
CA 2016166 C · Owner: Valmet-Ahlstrom Inc. · Inventors: Partanen, Hannu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method for forming fibrous paper or board web on a double wire section of a paper machine or equivalent the said double wire section comprising a first Wire loop (10) and a second wire loop (20) in conjuction with it. In the first dewatering zone (12a) of the double wire section where the paths of the both wire loops (10, 20) are substantially linear, the web direction is adjustably deviated towards the second wire loop (20). In the second dewatering zone (12b) Located after the first dewatering zone (12a) the web is curvedly directed towards the first wire loop (10) as a curved dewatering zone (12b). In the linear dewatering zone (12a) the second, wire …
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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 May 7, 1990 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2012.
- 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.