.~ Phase controlled switching using electronic tube or a three or more terminal semiconductive device
DEFINITION
Classification: 323/300
Phase controlled switching using electronic tube or a three or more terminal semiconductive device:
(under subclass 299) Subject matter wherein the input is alternating current and the final control device is an
electronic tube or three or more terminal semiconductive device which is caused to change to its conductive state at a controllable point following the zero axis crossing of the input waveform.
SEE OR SEARCH THIS CLASS, SUBCLASS:
237, for output level responsive phase controlled switching systems.
320, for external or operator controlled phase controlled switching systems.
SEE OR SEARCH CLASS
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
453+, for semiconductor controlled rectifiers which are involved in phase switching.
