US PATENT SUBCLASS 454 / 44
.~ Having lining or sleeve

Current as of: June, 1999
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454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
44.~ Having lining or sleeve {3}
45  DF  .~.~> Including breech opening
46  DF  .~.~> Pressurized air lining
47  DF  .~.~> Axially connected chimney or stack sections

DEFINITION

Classification: 454/44

Having lining or sleeve:

(under subclass 1) Subject matter comprising (1) an interior covering or coating for the vertical conduit section or (2) a member which encases 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.