Boiler
CA 2029950 C · Owner: Nakashima, Fumiya · Inventors: Nakashima, Fumiya; Oguri, Masaharu; Tokuda, Kimishiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A structure of a boiler of the type that pulverized fuel is burnt within a square barrel-shaped furnace having a vertical axis, is improved so that ignitability is improved and a produced amount of NOx is decreased. Burners for injecting pulverized fuel-air mixtures are disposed at the central portions of respective edges in a horizontal cross-section of a furnace wall as inclined downwards with respect to a horizontal plane. Also under, air nozzles for feeding air are disposed under the respective burners.
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 14, 1990 and granted April 16, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2012.
- 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.