Appeal No. 2004-0539
Application No. 09/921,254
combustion chamber adjacent the combustion zone and into a flue
gas inlet portion of the venturi tube at the throat thereof,
whereby the stream of flue gas is induced into a low pressure
area at the throat of the venturi and intermixed in the low
pressure area with a primary flow of combustion air (col. 3,
lines 4-21). Brazier notes that the mixing of the inert flue gas
with combustion air (34) before fuel is introduced and combusted
(at 26) retards the primary flame combustion while still
maintaining control and stability of the flame, thereby producing
a lower flame temperature and resulting in a reduction in NOX
production (col. 3, lines 22-33).
What the burner of Brazier lacks relative to appellants
claimed subject matter is any teaching of a fuel gas injector,
like that seen at (56/60) of appellants drawings, which extends
through the combustion chamber wall at a location adjacent the
combustion zone and positioned to direct a flow of fuel gas into
the combustion chamber at a location beyond the inner edge of the
entrance to the combustion chamber.
To supply this deficiency in Brazier, the examiner looks to
the burner of Bury, which burner is characterized as having very
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