Method and device for continuously producing compact multilayer paperboard sheets
CA 2218403 A1 · Owner: Rufo, Donato · Inventors: Rufo, Donato
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and a device for continuously producing compact multilayer paperboard sheets at high production rates and at a particularly competitive cost. The production device (10) comprises at least three mutually aligned feed rollers (11 21, 31, 41) that each support a roll (11a 21a) of a paper web (12, 22, 32, 42), and means for stacking and coating (13 23, 33) the webs with an adhesive, urging them together and pressing (14 24, 34) them. Said device comprises preheating means (71-75) for preheating each paper web (12 22, 32, 42) prior to coating, accelerated adhesive drying means (16 17, 26, 27, 36, 37) for generating a heat flow after the webs have been stacked and pressed following 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 January 31, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2019.
- 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.