US PATENT SUBCLASS 219 / 643
.~.~ Tube (i.e., pipe)

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

600  DF  INDUCTIVE HEATING {7}
635  DF  .~ Specific heating application {8}
643.~.~ Tube (i.e., pipe) {1}
644  DF  .~.~.~> Interior surface

DEFINITION

Classification: 219/643

Tube (i.e., pipe):

(under subclass 635) Subject matter wherein the heating is applied to a hollow cylinder.

SEE OR SEARCH THIS CLASS, SUBCLASS:

59.1+, for similar subject matter involving resistance heating.

607+, for bonding tubes.