Method and device for ventilating pocket spaces in a multi-cylinder dryer of a paper machine
CA 2120271 C · Owner: Virta, Raimo · Inventors: Virta, Raimo; Vuorinen, Vesa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for ventilating pocket spaces in a multi-cylinder dryer of a paper machine in particular a high-speed, paper machine whose running speed is higher than about 800 meters per minute, in the area of a so-called twin-wire draw. In the twin-wire draw, the drying cylinders in the drying group are arranged in two rows placed one above the other in which rows the, successive cylinders are placed in the upper row and in the lower row as interlocked. In each cylinder group there are two drying, wires, an upper wire and a lower wire for pressing the paper web against heated faces of the drying cylinder while being guided by guide rolls placed in gaps between the cylinders. The …
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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 March 30, 1994 and granted June 9, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2016.
- 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
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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.