Improved process for manufacturing board
CA 2414637 C · Owner: Strengell, Reetta · Inventors: Paren, Aarto; Strengell, Reetta; Jakara, Jukka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for manufacturing liquid packaging board in, which process a board pulp is treated with a percarboxylic acid by adding to the, pulp percarboxylic acid in an amount of 0.5 - 5 kg/ton of dry pulp indicated , as a, 100 per cent percarboxylic acid whereafter, or simultaneously with the percarboxylic acid treatment, sizing is carried out with a combination of a resin size, and a neutral size, which is followed by board forming. The manufactured board has, good resistance to liquid penetration.
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 18, 2002 and granted March 13, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2024.
- 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.