Appeal No. 1998-0425 Page 27
Application No. 08/272,527
measuring means includes flow measuring means for measuring
the respective flow or flows of gas through at least one
selected group among said at least two groups, and said
apparatus includes controlling means for controlling flow of
cleaning agent to one or more of said selected groups.
19. The apparatus according to claim 11 wherein said
diffusion elements are divided into at least two groups, said
measuring means includes flow measuring means for measuring
the respective flow or flows of gas through at least one
selected group among said at least two groups, and said
apparatus includes controlling means for controlling flow of
cleaning agent to one or more of said selected groups.
20. The apparatus according to claim 18 or 19 wherein
said controlling means is capable of passing cleaning agent to
one or more of said selected groups with a flow which differs
from the flow of cleaning agent, if any, to one or more other
groups among said at least two groups.
21. The apparatus according to claim 18 or 19 wherein
said measuring means includes pressure measuring means for
measuring the respective pressure or pressures of gas flowing
through at least one selected group among said at least two
groups, and said apparatus includes controlling means for
controlling the flow of cleaning agent to one or more of said
selected groups in response to measurements made by said
measuring means.
22. The apparatus according to claim 3 or 11 wherein
said sealing means, retaining means and plenums jointly
restrain vertical movement of said diffusion elements.
23. Liquid treatment apparatus comprising:
a gas distribution network in a tank;
a source of treating gas;
a source of cleaning agent;
a flow control device located in a flow path between said
source of cleaning gas and said gas distribution network;
a plurality of synthetic thermoplastic or thermoset resin
plenums;
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