US PATENT SUBCLASS 310 / 314
.~.~ Electrical systems

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}
314.~.~ Electrical systems {5}
315  DF  .~.~.~> Temperature compensation circuits
316.01  DF  .~.~.~> Input circuit for simultaneous electrical and mechanical output from piezoelectric element {2}
317  DF  .~.~.~> Input circuit for mechanical output from piezoelectric element
318  DF  .~.~.~> Input circuit for electrical output from piezoelectric element
319  DF  .~.~.~> Electrical output circuit

DEFINITION

Classification: 310/314

Electrical systems:

(under subclass 311) Subject matter for supplying electric energy via an electric circuit element to piezoelectric devices and/or electric circuit elements which are supplied with electric energy by piezoelectric devices.

(1) Note. The circuit element is other than just an

electrode of the piezoelectric device.

SEE OR SEARCH CLASS

73, Measuring and Testing,

67+, for piezoelectric transducers which couple an alternating current, electric circuit, and a device having mechanical vibrations for testing purposes and for the testing system which utilizes such transducers.

181, Acoustics,

101+, for acoustic wave (especially seismic) which may utilize a piezoelectric element. 307, Electrical Transmission or Interconnection Systems,

400, for electrical systems utilizing electrets.

318, Electricity: Motive Power Systems,

116, for electric motor control systems where the electric motor is of the piezoelectric type. Note that subclass 314 of this class (310) also contains some systems where electric potential is applied to a piezoelectric device.

322, Electricity: Single Generator Systems,

2, for the miscellaneous generator systems having a nonmagnetic generator (other than a piezoelectric generator).

324, Electricity: Measuring and Testing,

727, for processes of and means for subjecting a piezoelectric crystal to an electric test, as for the purpose of predicting its frequency drift, or of determining the polarity of charge produced by mechanical stress, or of determining its activity. Search subclasses 76.39+ for frequency meters, per se.

330, Amplifiers,

5.5, for solid element wave propagating amplifiers wherein the solid element may be of the piezoelectric phonon type, and subclass 174 for amplifiers having electromechanical transducers, which may be piezoelectric crystals, in a signal coupling circuit.

333, Wave Transmission Lines and Networks,

149, for delay networks utilizing piezoelectric devices, and subclasses 187+ for filters utilizing piezoelectric devices. 361, Electricity: Electrical Systems and Devices,

211, for electric circuits for relays which may be piezoelectric.

363, Electric Power Conversion Systems, appropriate subclasses for such systems utilizing piezoelectric devices.

367, Communications, Electrical: Acoustic Wave Systems and Devices,

140+, for piezoelectric transducers used in electrical acoustic wave communication.

369, Dynamic Information Storage or Retrieval,

144, for a piezoelectric phonograph pickup.

600, Surgery,

437+, for ultrasonic systems which may include a piezoelectric element.

601, Surgery: Kinesitherapy,

15+, and 46+ for ultrasonic systems which may include a piezoelectric element.