US PATENT SUBCLASS 219 / 108
.~.~ Systems of current supply

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.~.~ Systems of current supply {7}
109  DF  .~.~.~> With indicator (e.g., recorder)
110  DF  .~.~.~> Controlled in response to current, voltage, or temperature
111  DF  .~.~.~> Repeat or interrupted current systems (e.g., multiple welds, multiple heated weld)
112  DF  .~.~.~> Stored energy discharge (e.g., inductive) {1}
114  DF  .~.~.~> With space-discharge tube control (e.g., thyratron, ignitron)
115  DF  .~.~.~> Synchronous switching on and off
116  DF  .~.~.~> With transformer

DEFINITION

Classification: 219/108

(under subclass 78.01) Subject matter relating to the system for supplying the electric current which produces the heating.

SEE OR SEARCH THIS CLASS, SUBCLASS:

130.1+, for similar subject matter used in arc welding.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems, for miscellaneous voltage or current control systems.