Recovery boiler
CA 2220325 C · Owner: Hino, Hirokazu · Inventors: Hino, Hirokazu; Tokuda, Kimishiro; Ichinose, Toshimitsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Object: To provide a recovery boiler for recovering soda component from pulp spent liquor, which is able to prevent carry-over of unburnt char and deformation of char bed configuration and to attain a stable combustion with low NOx generation. Solving means: By regulating combustion air supply and, feeding inert gas along furnace side wall around char bed as the case may be, there are formed a combustion zone of reduction atmospheric field where air ratio in surroundings of char bed is 0.8 or less, a combustion zone of reduction atmospheric field where air ratio is 1.0 or less and unburnt components exist (including a case to form reduction atmospheric field where air ratio is 1.0 or less …
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
- Filed November 5, 1997 and granted January 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 5, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 2019.
- 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.