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Expired Canadian patentCanada

Method for deeply staged combustion

CA 2135941 C · Owner: Kobayashi, Hisashi · Inventors: Kobayashi, Hisashi

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A combustion method for carrying out combustion with reduced generation of NOx wherein high velocity fuel and oxidant in a very low substoichiometric ratio are combusted and thereafter secondary oxidant mixes and combusts with the resulting combustion reaction products.

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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 November 16, 1994 and granted January 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2014.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2016.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 16, 1994
GrantedJanuary 25, 2000
Term endedNovember 16, 2014
Patent numberCA 2135941 C
Classification (IPC)F23C9/06 +2 more

Timeline

Timeline From CIPO dates

1995199719992001200320052007200920112013Application filedNov 16, 1994Patent grantedJan 25, 2000Term endedNov 16, 2014

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.