(under subclass 13) Subject matter wherein an adjustable resistor is combined with a float, which is mechanically linked with the resistor actuator to vary the resistance value in accordance with the position of the float.
(1) Note. The subject matter in this subclass is usually a subcombination of a liquid level or depth gauge as classified in Class 73, Measuring and Testing, subclasses 305+. Where the indicator is recited as an added element, classification is in subclasses 305+ of Class 73. The mere recitation of the tank broadly does not preclude classification in this class (338). Where details of the tank are recited, classification is elsewhere such as Class 137, Fluid Handling, subclass 560 for a tank with an out- flow pipe together with a float operated rheostat.
SEE OR SEARCH THIS CLASS, SUBCLASS:
34+, for resistors whose resistance value is dependent on the gas, vapor, or moisture absorbed or collected.
36+, for mechanically variable resistors with structure responsive to fluid pressure.
68+, for mechanically adjustable or variable resistors, per se. SEE OR SEARCH CLASS
73, Measuring and Testing,
305+, for liquid level or depth gauges including a float operated rheostat; and subclasses 451+ for specific gravity or density measurement of a liquid including a float operated rheostat. See also (1) Note above.
137, Fluid Handling, appropriate subclasses, for fluid handling systems. See also (1) Note above.
