(under the class definition) Devices in which the joint is completely or partially surrounded by a housing to control heat exchange or to act as a protective or ornamental cover, or is provided with a protective liner, or electrical insulation means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
114+, for strain relief combinations.
123.1+, for a coupling for concentric plural noncommunicating pipes.
123.3+, for inner to spaced outer tube coupling.
222.1+, for sheathed flexible pipe involving more than one distinct connection. 287.1, for means for preventing the entrance of roots to a joint.
SEE OR SEARCH CLASS
138, Pipes and Tubular Conduits,
100, 178 for appropriate pipe structure, per se.
156, Adhesive Bonding and Miscellaneous Chemical Manufacture, appropriate subclass for methods of making electrical insulation by a laminating operation.
428, Stock Material or Miscellaneous Articles, appropriate subclasses for a stock material product in the form of a single or plural layer web or sheet, and especially
920, (a cross-reference art collection) for a product having a heating insulating feature.
