US PATENT SUBCLASS 338 / 237
.~.~.~ Hermetically sealed

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

226  DF  INCASED, EMBEDDED, OR HOUSED {22}
234  DF  .~ With gaseous or vacuum spacing between element and casing or housing {2}
236  DF  .~.~ Spacing of uniform thickness over length of element {1}
237.~.~.~ Hermetically sealed

DEFINITION

Classification: 338/237

(under subclass 236) Subject matter wherein the gaseous or vacuum spacing is completely sealed from the exterior of the resistor, as to prevent the passage of any gas or moisture.

(1) Note. The sealing for classification in this subclass must be something more than a mere tight fit between surfaces of the element, terminals, and/or casing, as by a plug. The subject matter classified here usually involves some bonding between the surfaces, as produced by cementing, soldering, or fusing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

164, for mechanically variable resistors with an angularly slidable contact and a hermetically sealed housing.

248, 250, 269, and 275, for resistors at least part of the casing or housing thereof being formed and hardened on the resistor, e.g., molded.

257, and 262+, for resistors at least part of the casing or housing thereof being formed as a coating.

274, for resistors whose terminal extends into an end of an elongated casing or housing with a sealing plug, disc, or cap. SEE OR SEARCH CLASS

174, Electricity: Conductors and Insulators,

17+, and 50.5+ for hermetically sealed boxes and housings limited by claim to electrical use.