Method of making sulphate pulp
CA 1203055 A · Owner: Sunds Defibrator Aktiebolag · Inventors: Mjoberg, Per J.; Sjodin, Lars T.; Lekander, Karl-Erik
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 modified batch cooking technique for the making of sulphate pulp with high delignification degree or with normal delignification degree with increased pulp viscosity. According to the invention, this is effected by one or several displacements of the liquor in the digester with liquor of the same temperature as the cooking liquor but with a lower lignin content. Economies in sulphate pulp production are achieved by practising our novel process.
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
- Granted April 15, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 15, 2003.
- 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.