US PATENT SUBCLASS 219 / 115
.~.~.~ Synchronous switching on and off

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
78.01  DF  .~ For bonding with pressure (e.g., resistance welding) {16}
108  DF  .~.~ Systems of current supply {7}
115.~.~.~ Synchronous switching on and off

DEFINITION

Classification: 219/115

(under subclass 108) Subject matter having means to energize or deenergize the system in timed relation to the voltage oscillation of an alternating current supply system.

(1) Note. Switching may be accomplished, for example, only at the voltage or current zero, or in such a manner as not to cause saturation of a transformer.