(under subclass 690) Subject matter which means are provided for receiving a signal or control energy from the transmitter and delivering to the receiver motor a signal or control energy, the magnitude or energy content of which is appreciably greater than that received from the transmitter.
(1) Note. This subclass excludes mere voltage or current transformer systems where the magnitude of either the voltage or current output is greater than the input voltage or current, but the energy content at the output is the same or less than the input energy.
SEE OR SEARCH THIS CLASS, SUBCLASS:
505+, for motor armature or primary circuit control by space discharge devices.
727+, for induction motor control by space discharge devices in the primary circuit.
818+, for induction motor control by space discharge devices in the field or secondary circuit. SEE OR SEARCH CLASS
323, Electricity: Power Supply or Regulation Systems, appropriate subclasses for miscellaneous systems for controlling the output of electrical energy by means of a smaller quantity of electrical energy.
330, Amplifiers, appropriate subclasses for amplifiers generally (where the output signal wave shape is a substantial replica of the input wave shape).
