Method of manufacturing a recyclable paper product
CA 2175993 A1 · Owner: Raisio Chemicals Oy · Inventors: Nurmi, Kari; Gottberg, Jens-Mikael; Hamunen, Antti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is related to a method of manufacturing a paper product containing anionic laminating coating or sizing agents, said paper product being free from carry-over speck defects in recycle use. The method is characterized in that a cationic compound is added to the paper web after the formation of the web.
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 September 30, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 30, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 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
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.