US PATENT SUBCLASS 338 / 206
EXPANDED METAL TYPE
Current as of: June, 1999
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DEFINITION
Classification: 338/206
(under the class definition) Subject matter wherein the resistance element is formed of expanded metal as defined in (1) Note below.
(1) Note. Expanded metal type resistance elements are those formed from a metal resistance strip by cutting or otherwise forming closely spaced transverse slots in the strip so as to establish a grid or tortuous current path between terminals. The slots formed are generally as near zero in width as possible and the metal on either side of each slot is bent out of the general plane of the original sheet to separate the sides of the slots. The separating of neighboring sides of the transverse slots may also be obtained by stretching the strip longitudinally. Generally the spacing obtained between the sides of slots is greatest at the center and tapers together at either end.
(2) Note. This subject matter is distinguished from zigzag or sinuous resistors in that the transverse slots are closed at both ends and therefore provide more than one path for the current to flow, as opposed to the single conductance path generally provided by a zigzag or sinuous resistor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
208, for mesh, woven, or braided resistors.
283+, for resistors with zigzag or sinuous resistance elements. See also (2) Note above. 322, for resistors with plural elements in parallel between terminals.
333, for a resistor of a particular configuration and/or dimension.
