Method of treating lignocellulosic or cellulosic pulp to promote the kinking of pulp fibres and/or to improve paper tear strength
CA 1102969 A · Owner: Development Finance Corporation Of New Zealand · Inventors: Kerr, Allan J.; Kibblewhite, Robert P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described of saturating a lignocellulosic or a cellulosic pulp with gaseous ammonia. Preferably moist pulp is subjected to a substantially gaseous ammonia atmosphere under elevated pressure. The process enables better quality paper to be produced from higher yield pulps by promoting kinking of pulp fibres and/or improves tearing strength in such paper. Ammonia previously has been used as a base in oxidative delignification but not in a discrete step. - 1 -
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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
- Granted June 16, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 1998.
- 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.