Regenerative oxygen preheat process for oxy-fuel fired furnaces
CA 2257705 C · Owner: Kobayashi, Hisashi · Inventors: Kobayashi, Hisashi
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 supplying oxygen to an oxy-fuel fired furnace that has been preheated by heated flue gas recycled from the furnace. One or more regenerators are provided each having at least a first and a second regenerator bed. The beds are alternately cycled so that one is being preheated with hot flue gas exhausted from the furnace while the other is preheating oxygen through its already heated bed for supply to the furnace burner. The amount of hot flue gas supplied to the regenerator beds is controlled by continuously venting a portion of the total furnace flue gas so as to bypass the regenerators and the, regenerator beds are purged of residual oxygen by recycled cooled …
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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
- Filed January 4, 1999 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2021.
- 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.