(under subclass 283) Subject matter wherein the zigzag or sinuous element lies substantially over its entire length in a groove in a base forming a supporting structure.
(1) Note. The resistance element may be coated on the walls of a zigzag or sinusoidal shaped groove.
(2) Note. For classification in this subclass the zigzag or sinuous element must be disposed in the groove over substantially its entire length, as where the walls of the groove, i.e., the base, provide rigidity for the element. In subclass 290 below the element merely projects in or through an opening, which may be a groove, over a small portion of its length, as for supporting the element or suspending the element between spaced portions on a frame or other support.
SEE OR SEARCH THIS CLASS, SUBCLASS:
252+, for an incased resistor whose element is embedded in a groove in the casing.
290, for a zigzag or sinuous resistor whose element projects in or through an opening or slot in a supporting frame. See also (2) Note above.
303, for a helical or wound resistor whose element is disposed in a helical groove on the core. 311, for resistors generally having an element mounted in a groove in the base.
317, for resistors generally having an element projecting or threading through a support.
