Production of fiber webs by the airlaid process
CA 2306514 A1 · Owner: Poths, Holger · Inventors: Poths, Holger; Goetze, Richard; Wierer, Konrad Alfons
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for producing fiber webs by the airlaid process of laying down the fibers and the pulverulent binder in an air stream, which includes a first step of laying a fiber web or fibers up to a basis weight of 10 to 50 g/m2 a, subsequent step of laying down fibers and a thermoplastic polymer powder based on polymers of one or more monomers such as a vinyl ester or a (meth)acrylic ester separately or as a mixture in the air stream in an amount of 10 to 300 g/m2 and if, appropriate, repeating this step until the desired basis weight is obtained, and consolidating the fiber material at temperatures of. 80°C to 260°C and, if appropriate at a , pressure, of up to 100 bar.
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 April 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2022.
- 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.