Recovering turpentine and heat from black liquor from a continuous digestor
CA 1049713 A · Owner: A. Ahlstrom Osakeyhtio · Inventors: Hakulin, Bertel; Henricson, Kaj O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of recovering turpentine and heat in connection with the evaporation of black liquor emerging from a continuousworking cellulose digester at a high temperature and under high pressure, wherein the black liquor is evaporated by expansion and vapors derived from the expansion evaporation of the black liquor are brought into an indirect heat exchange contact with the digesting liquor or with a precursor thereof in order to concentrate the latter.
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 6, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 6, 1996.
- 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.