US PATENT SUBCLASS 138 / 28
.~.~ Expansible or compressible tube element

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

26  DF  WITH PRESSURE COMPENSATORS {2}
27  DF  .~ Freeze protecting {1}
28.~.~ Expansible or compressible tube element

DEFINITION

Classification: 138/28

(under subclass 27) Devices in which the tube itself or a part thereof is expansible or an element in the tube is compressible to allow for the expansion of the fluid when it freezes.