Appeal No. 1998-0425 Page 30
Application No. 08/272,527
30. The apparatus according to claim 29 wherein said at
least one controlling device 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.
31. The apparatus according to claim 29 or 30 wherein
said at least one measuring device includes at least one
pressure measuring device capable of measuring the respective
pressure or pressures of gas flowing through at least one
selected group among said at least two groups, and said at
least one controlling device is capable of controlling flow of
cleaning agent to one or more of said selected groups in
response to measurements made by said measuring device.
32. The apparatus according to claim 23 wherein said
sealing means, retaining means and plenums jointly restrain
vertical movement of said diffusion elements.
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