Pipes and tubular conduits – Plural duct – With spacer and encircling element
Reexamination Certificate
2011-03-29
2011-03-29
Brinson, Patrick F (Department: 3754)
Pipes and tubular conduits
Plural duct
With spacer and encircling element
C138S114000, C138S113000, C138S157000, C138S161000
Reexamination Certificate
active
07913718
ABSTRACT:
A noise reduction system for use with a DWV system to reduce the noise emitted from the DWV system when waste water flows through the DWV system. The noise reduction system includes a sleeve and a spacer. The noise reduction system is mounted on the pipes and fittings of the DWV system.
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Brinson Patrick F
Fraser Trebilcock Davis & Dunlap, P.C.
Moyne Mary M.
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