US PATENT SUBCLASS 310 / 341
.~.~ With temperature modifier and/or gas or vapor atmosphere control

Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

300  DF  NON-DYNAMOELECTRIC {4}
311  DF  .~ Piezoelectric elements and devices {17}
341.~.~ With temperature modifier and/or gas or vapor atmosphere control {3}
342  DF  .~.~.~> For plural piezoelectric elements
343  DF  .~.~.~> With heating element
344  DF  .~.~.~> Sealed unit

DEFINITION

Classification: 310/341

With temperature modifier and/or gas or vapor atmosphere control:

(under subclass 311) Subject matter having means to maintain or change the temperature of the piezoelectric element, or having means to control or confine gas or vapor around the element.

(1) Note. Subject matter of this subclass type includes, for example, heat sinks, heat shields, fans, and cooling fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

346, for a piezoelectric element combined with structure whose properties compensate for undesired changes in the device which would result from temperature change.

SEE OR SEARCH CLASS

174, Electricity: Conductors and Insulators, appropriate subclasses for housing and envelopes having means for conducting electricity between the inside and outside of the housing or envelope, including such devices as are used for piezoelectric elements. See

9, for those involving the use of a vacuum, subclass 14 for those having fluid conditioning or maintenance means, subclasses 15.1+ for those having temperature modifying means, subclasses 17.05+ and 50.5+ for hermetically sealed envelopes, and subclasses 50+ for miscellaneous boxes and housings. 219, Electric Heating,

19+, for electric heating apparatus, per se, designed to produce a constant temperature.

220, Receptacles, appropriate subclasses for the structure of housings, casings, and envelopes, per se. Note particularly

2.1+, where the housing, casing, or envelope is of the electric discharge tube or similar (such as piezoelectric crystal) type.

331, Oscillators,

69, for oscillators with outer casing or housing provided with means to modify the temperature therein and wherein the oscillator may utilize a piezoelectric crystal element, and subclass 70 for oscillators which may utilize a piezoelectric crystal element with means to modify the crystal temperature.