Process for the pulping of lignocellulosic material with alkali and quinones or hydroquinones
CA 1096560 A · Owner: Mo Och Domsjo Aktiebolag · Inventors: Samuelson, Hans O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided for the alkaline pulping of lignocellulosic material with sodium hydroxide as the active alkali which is capable of, producing pulp in a yield and quality quite comparable with sulfate pulp. The process is a two stage process without defibration between the two, stages and comprises subjecting lignocellulosic material such as wood to a first pulping stage at a temperature within the range from about 145° to about 200°C in a pulping liquor comprising sodium carbonate and/or sodium bicarbonate while removing carbon dioxide generated in the pulping stage, and then continuing the pulping without an intervening defibration at a temperature within the range from about 145° …
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 March 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 3, 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.