.~.~.~> Of particular construction and/or material (e.g., infrared generator)
DEFINITION
Classification: 219/552
(under subclass 538) Subject matter wherein the heating unit structure comprises significant details of a particular resistance or other type heating element.
(1) Note. The resistor structures in this and the indented subclasses are similar to the electrical resistor structure to be found in Class 338, but are restricted to those resistive devices peculiarly adapted to efficiently convert electrical energy into heat energy and limited to use in the heating devices under the class definition of this class (219). The resistor structures in Class 338 are primarily and peculiarly adapted for use as current impeding or limiting electrical resistors where the heat generated is incidental or undesired and secondary to the primary current impeding or limiting function. See Lines With Other Classes and Within This Class in Class 338, Electrical Resistors, for a more detailed explanation of the line between Class 318 and Class 219.
