(under subclass 334) Apparatus in which an electric heating element is used to heat the fluid or the device or a part thereof.
(1) Note. Electric elements used to actuate parts of the fluent material device, such as a valve, and which are in the flow path of the fluent material, are not included in this subclass even though they incidentally may heat the fluent material as an inherent part of their mode of operation, since they are not effective as heat exchange means except during valve actuation. Such devices have been classified as
valve actuators.
SEE OR SEARCH THIS CLASS, SUBCLASS:
66, for thermoelectric combustion failure responsive fuel safety cut-offs for burners.
76, for heaters for destructible or fusible elements in safety cut-offs.
SEE OR SEARCH CLASS 138, Pipes and Tubular Conduits,
33, for electric thawing and freeze protection for pipes and tubular conduits.
219, Electric Heating,
628+, for inductive fluid heating, subclasses 687+ for microwave fluid heating, and subclass 772 for the capacitive dielectric heating of fluent materials, and subclasses 280+ for other electric fluid heating apparatus.
251, Valves and Valve Actuation,
11, for electrical heat motor valve actuators, and subclasses 139 and 140 for solenoid operated valves where the solenoid is within or surrounds the flow path. See (1) Note above.
