US PATENT SUBCLASS 310 / 321
.~.~ Combined with resonant structure

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}
321.~.~ Combined with resonant structure {4}
322  DF  .~.~.~> Acoustic wave type generator or receiver
323.01  DF  .~.~.~> Direct mechanical coupling {5}
324  DF  .~.~.~> Diaphragm
325  DF  .~.~.~> Sandwich or Langevin type

DEFINITION

Classification: 310/321

Combined with resonant structure:

(under subclass 311) Subject matter wherein the piezoelectric element is combined with structure whose natural frequency of vibration is disclosed as being the same as the operating frequency of vibration of the piezoelectric element.

(1) Note. "Resonant structure" is intended to be structure other than a mere support for a piezoelectric resonator.

(2) Note. Examples of devices found in this subclass would be composite resonators (e.g., tuning forks or electric filters) comprised of piezoelectric elements mounted on structure which together have a resonant frequency within the operating frequency of the device, the piezoelectric element(s) being either input and/or output transducers for the device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

345, and 348, for mounting devices for piezoelectric elements

that may resonate.

SEE OR SEARCH CLASS

84, Music, 409, for tuning forks.

178, Telegraphy,

70, for tuning forks.

333, Wave Transmission Lines and Networks,

187+, for piezoelectric wave filters (combination of piezoelectric element and resonator).

368, Horology: Time Measuring Systems or Devices,

155+, for resonant vibrators.