US PATENT SUBCLASS 219 / 607
.~.~.~ Tube (i.e., pipe)

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

600  DF  INDUCTIVE HEATING {7}
602  DF  .~ Metal working {1}
603  DF  .~.~ Bonding {7}
607.~.~.~ Tube (i.e., pipe) {5}
608  DF  .~.~.~.~> With electrical control (e.g., speed, temperature, gaging thickness, etc.)
609  DF  .~.~.~.~> Layering (e.g., coating, lining, etc.)
610  DF  .~.~.~.~> With preheating or postheating
611  DF  .~.~.~.~> Plural (e.g., end to end, etc.)
612  DF  .~.~.~.~> Seam bonding {2}

DEFINITION

Classification: 219/607

Tube (i.e., pipe):

(under subclass 603) Subject matter wherein the metal workpiece is bonded together to form a hollow cylinder or plural hollow cylinders forming one unit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

59.1+, for similar subject matter involving resistance heating.

643+, for heating a preformed tubular object.

SEE OR SEARCH CLASS

228, Metal Fusion Bonding,

60, for tube end closing and subclasses 144+ for edge joining of a piece blank or strip.

285, Pipe Joints or Couplings, 41, for heating or cooling thereof.