Method and apparatus for cooling hot gases
CA 2086674 A1 · Owner: Arpalahti, Olli · Inventors: Arpalahti, Olli
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for cooling the exhaust gases from a molten phase furnace, such as a smelting furnace (10). The exhaust gases are conveyed from the furnace to a vertically extending cooling shaft (24) disposed above the furnace where the exhaust gases , are indirectly cooled by means of cooling gas in a circulating gas system (14). From the cooling shaft the exhaust gases are, conveyed to a waste heat boiler (18) where heat is recovered from, the exhaust gases as saturated or superheated pressurized steam.
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 July 1, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 1, 2013.
- 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.