Appeal No. 2004-0539
Application No. 09/921,254
these two processes of recycling the flue gasses, on the one
hand, and staggering the supply of fuel gas and the combustion
air, on the other hand." At column 3, lines 39-43, Bury further
indicates that by combining the two known and afore-mentioned
means for reducing the production of nitrogen oxides, a good
combustion mixture is obtained without creating a zone of
turbulence, thereby resulting in the content of nitrogen oxides
in the flue gases being reduced by at least 70%. Thus, Bury
discloses a burner (Figs. 1-2) for producing very small NOX
emissions by simultaneously utilizing both recycling of flue
gases and staggering of the supply of fuel gas and the combustion
air, wherein the burner includes, inter alia, and in addition to
a flue gas recycling means, a set of fuel gas injectors (10)
extending through the combustion chamber wall (1) at a location
disposed outside combustion air supply passage (2) and
peripherally distributed thereabout, and located adjacent the
combustion zone and radially beyond the inner edge of the central
entrance to the combustion chamber.
In the examiner's view, based on the collective teachings of
Brazier and Bury, it would have been obvious to one of ordinary
skill in the art at the time appellants' invention was made to
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