Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Reexamination Certificate
2007-10-23
2007-10-23
Menon, Krishnan S. (Department: 1723)
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
C210S086000, C210S087000, C210S117000, C210S136000, C210S805000, C210S652000, C138S043000, C138S045000, C138S046000
Reexamination Certificate
active
10987445
ABSTRACT:
A reverse osmosis water filtering system includes a reverse osmosis membrane having first output port for permeate water, second output port for concentrate water, and intake port for receiving filtered water, a filtering assembly providing filtered water to the membrane, and a flow restrictor restricting a flow of concentrate water from the membrane to a water source, the flow restrictor including a housing defining an elongated conduit having a tapering conical wall defining a first screw thread and a water-channel thread extending therealong including generally between a first opening into a distal region of the conduit for receiving a flow of liquid and a second opening into a proximal region of the conduit, and an axially elongated plug received into the conduit, a surface of the plug opposed to the tapering conical wall defining a second screw thread and a tapering surface, the second screw thread disposed in threaded engagement with the first screw thread defined by the conical wall of the housing, opposed surface of the water-channel thread and the tapering surface of the plug being disposed in sealing engagement within the conduit and opposite to define a region for liquid flow, the housing with the water-channel thread and the tapering surface of the plug thereby cooperatively defining a generally spiral liquid flow path along the water-channel screw thread and the tapering surface, for flow of liquid generally between the first opening and a port defined by the flow restrictor for delivery of liquid from the conduit.
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International Search Report, Patent Cooperation Treaty, International Application No. PCT/US04/37811, Aug. 9, 2004, 15 pages.
Fish & Richardson P.C.
Menon Krishnan S.
Watts Regulator Co.
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