US PATENT SUBCLASS 166 / 236
.~ Concentric pipes
Current as of: June, 1999
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DEFINITION
Classification: 166/236
(under subclass 227) Devices comprising a plurality of concentrically positioned pipe sections at least one of which has straining openings.
SEE OR SEARCH THIS CLASS, SUBCLASS:
228, for concentric pipes with porous material therebetween.
230, for screens in which a concentric pipe section is made of a woven fabric such as a wire mesh.
232, and 233, for screens in which a concentric pipe section is made of a spiral element providing straining openings.
234, for screens in which one or more concentric pipes are made of elongated elements providing straining openings.
