US PATENT SUBCLASS 454 / 47
.~.~ Axially connected chimney or stack sections

Current as of: June, 1999
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454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
44  DF  .~ Having lining or sleeve {3}
47.~.~ Axially connected chimney or stack sections

DEFINITION

Classification: 454/47

Axially connected chimney or stack sections:

(under subclass 44) Subject matter comprising at least two parts which are attached together end-to-end to form the vertical conduit section.

SEE OR SEARCH CLASS

285, Pipe Joints or Couplings,

47+, for a joint or coupling with an insulated casing, lining, or protector.