US PATENT SUBCLASS 138 / 113
.~ Surrounding radially spaced duct with axially spaced supports for internal duct


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

111  DF  PLURAL DUCT {4}
113.~ Surrounding radially spaced duct with axially spaced supports for internal duct


DEFINITION

Classification: 138/113

(under subclass 111) Device wherein an inner duct is surrounded by a coextensive duct and radially spaced therefrom by a plurality of axially spaced support members.

SEE OR SEARCH THIS CLASS, SUBCLASS:

108, for a duct having means therein to support an element which, per se, is subject matter for other classification.