Method of refining of fibre material
CA 1107941 A · Owner: Sca Development Aktiebolag · Inventors: Hellerqvist, Gustaf R. (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods for treating steam containing impurities generated during the refining of fibrous materials are disclosed including washing the steam, with water neutralizing acids contained in the steam and reducing the, oxygen content of inert gases contained in the steam to thereby produce (a) steam which is substantially free of impurities and (b) wash water which, contains a substantial portion of those impurities. Preferably the washing neutralizing and reducing steps are carried out in a single purification device, such as a bubble tray column or a cyclone scrubber.
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 September 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 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.