Method of improving the homogenity at periodical digestion of ligno-cellulose containing material
CA 1081908 A · Owner: Sca Development Aktiebolag · Inventors: Backlund, Sture O.E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of improving homogeneity in batch digestion of lignocellulose containing material in a digester the circulation system of which, is designed so that the cooking liquid is drawn off from the digester via a strainer girdle, heated in a calorisator and returned to the top and bottom respectively, of the digester. During the heating phase the digester is subjected to boiling-up brought about by periodically heating only from below by a substantial supply of heat via the bottom circulation with a cooking liquid flow of 1-15m3/minute, preferably .3-8m3/minute at the same time as, the top circulation is held closed and pressure drop in the digester is prevented. The number of the …
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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 July 22, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 22, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.