US PATENT SUBCLASS 285 / 123.15
.~.~ Double-walled or duplex joint

Current as of: June, 1999
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285 /   HD   PIPE JOINTS OR COUPLINGS

120.1  DF  HAVING PLURAL INDEPENDENT PATHS {4}
123.1  DF  .~ For concentric tubes or pipes (e.g., well casing or wellhead type) {4}
123.15.~.~ Double-walled or duplex joint {1}
123.16  DF  .~.~.~> Wall configured as mating complementary type (e.g., hot air ducts)

DEFINITION

Classification: 285/123.15

Double-walled or duplex joint:

(under subclass 123.1) Subject matter comprising an inner pipe concentric with and attached to an outer pipe, forming one unit.