(under the class definition) Adjustable inductor devices having a core and a coil which are relatively movable with respect to each other so that the effective inductance of the device may be varied.
20, where the inductor device has a deformable or distortable coil or core.
40, where the movement between the coil and core is due to the magnetic force existing between the coil and core.
77, where the core is a portion of a short-circuited conductor or conductive member which is movable with respect to the coil. 117+, where the inductor device includes two coils which are movable relative to each other, the core being movable relative to at least one of the coils.
221, for the structure of coil and core not elsewhere provided for.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism,
10+, and the subclasses specified in the Notes thereto for mechanical mechanism for rotating a shaft including such mechanism designed for use with an adjustable inductor device. Also see the search notes to subclass 10 of Class 74 for the classification of other rotary shaft moving mechanism and for the line between Class 336 and Class 74.
323, Electricity: Power Supply or Regulation Systems,
216, 264, and 347 for miscellaneous inductive reactor systems where the reactor includes a relatively movable core and coil.
330, Amplifiers,
169, for amplifiers having transformer coupling including means for adjusting inductive coupling of the transformer.
334, Tuners, appropriate subclasses for tuned networks for use in wave energy apparatus and comprising inductance and capacitance elements in circuit arrangement to form a resonant circuit and in which structure is provided for adjusting one or both of these elements for changing the mean resonant frequency of the circuit. The adjustable inductance is usually of the movable core type.
343, Communications: Radio Wave Antennas,
748, for loop type antennas with a variable reactance for tuning the antenna.
