Arrangement and method for treatment of webs using nozzles with negative pressure
CA 2077514 C · Owner: Rintanen, Jaakko · Inventors: Rintanen, Jaakko; Heikkila, Pertti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an arrangement of nozzles with negative pressure intended for the treatment of webs. A nozzle directs a drying and supporting gas flow at the web and which has a box construction, and a nozzle space formed at one side of the nozzle. The nozzle space is provided with a nozzle slot defined by nozzle walls. One of the walls operates as a curved guide face which is fitted to turn the gas flow passed out of the nozzle slot, based on the Coanda effect so as to make it, parallel to the carrier face formed on the top face of the nozzle. At least one second nozzle slot is provided at a distance before said first nozzle slot in the running direction, of the web. A flow …
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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 September 3, 1992 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2014.
- 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.