US PATENT SUBCLASS 219 / 92
.~.~.~.~ Current limitation (e.g., by interposed insulation)

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}
86.1  DF  .~.~ By spot bonding {12}
91.2  DF  .~.~.~ Methods {4}
92.~.~.~.~ Current limitation (e.g., by interposed insulation) {2}
93  DF  .~.~.~.~.~> By localized projection
94  DF  .~.~.~.~.~> By interposed button

DEFINITION

Classification: 219/92

(under subclass 91.2) Subject matter in which the heating current is made to localize at particular points of the workpiece by means other than the electrodes.

(1) Note. The workpieces to be bonded, for example, may be coated with insulating paint on the contacting faces except at those points where bonding is to take place.