Device for supporting, turning and spreading of a web
CA 2006811 C · Owner: Rajala, Raimo · Inventors: Parvinen, Jukka; Jokioinen, Ilkka; Rajala, Raimo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for contact-free supporting turning, and spreading, of a paper web comprises a face (K) curved in accordance with the turning of the web (W), in connection with which face (K) the web (W) runs supported by air blown in between the face (K) and the web (W). The nozzle members in the device comprise guide faces (28a 28b) and, carrier faces (27, 37) placed in connection with the guide faces air, being blown through nozzle slots (26a,26b,36) in the nozzle members transverse to the direction of running of the web (W) onto the, carrier faces (27,37). The nozzle slots (26a,26b,36) are from one, side, defined by the guide faces (28,28b,38). The air-supported face (K) in the device is …
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 December 28, 1989 and granted January 11, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2011.
- 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.