Web former for a paper machine
CA 2087043 C · Owner: Valmet Paper Machinery Inc. · Inventors: Aula, Jouko; Jaakkola, Jyrki; Odell, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a twin-wire web former for a paper machine, whose wires (10,20) form a twin-wire forming zone (V1-V2) between them on which, zone water is drained out of the web (W) through both of said wires (10,20). After the twin-wire zone the web (W) is separated from the covering wire (20) and is transferred on the carrying wire (10) to its pick-up point. In hybrid formers (Fig. 1) after, the single-wire forming zone (10a) and in gap, formers (Fig. 2), after the curved forming zone (a0) placed directly after the forming gap (G) there is a, forming shoe (30;30A) provided with a ribbed deck (31) and fitted inside one of the wire loops (10/20). This forming shoe (30;30A) is …
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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 January 11, 1993 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 11, 2015.
- 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.