(under the class definition) Devices for thawing the frozen fluid in pipes or pipes having means for preventing the fluid from freezing or for preventing the bursting of the pipe when the fluid freezes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
27+, where the device allows for the expansion of the fluid.
SEE OR SEARCH CLASS
73, Measuring and Testing,
277, for similar devices tied up with the structure of a water meter or its casing.
123, Internal-Combustion Engines, 41.5, for similar devices tied up with the structure of an internal combustion engine cooling system.
137, Fluid Handling,
59+, for fluid handling systems including safety devices responsive to freeze conditions, subclass 107 for drain or waste valves responsive to the stopping of the main line flow, subclasses 301+ for hydrants having means for preventing freezing, subclasses 334+ for fluid handling devices including heating means to prevent freezing, subclass 375 for jacketed or insulated fluid handling apparatus and subclass 596 for stop and waste devices.
165, Heat Exchange,
134.1, for a heat exchanger with a protector.
237, Heating Systems,
80, for similar devices tied up with a heating system.
