US PATENT SUBCLASS 333 / 186
.~ Electromechanical filter

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


333 /   HD   WAVE TRANSMISSION LINES AND NETWORKS

24 R  DF  COUPLING NETWORKS {15}
186.~ Electromechanical filter {5}
187  DF  .~.~> Using bulk mode piezoelectric vibrator {2}
193  DF  .~.~> Using surface acoustic waves {3}
197  DF  .~.~> Plural mechanically coupled bar, plate, or rod-type resonating means {2}
200  DF  .~.~> Reed- or fork-type resonators
201  DF  .~.~> Magnetostrictive wave transmission path

DEFINITION

Classification: 333/186

Electromechanical filter:

(under subclass 24) Subject matter including at least one electrical wave driven mechanical vibrator as a frequency determining element, providing free transmission of electric waves of a single frequency or band of frequencies (which may include zero frequency) while attenuating substantially electric waves having other frequencies, or attenuating substantially electric waves of a single frequency or band of frequencies (which may include zero frequency) while permitting free transmission of electric waves having other frequencies, and systems within the class definition which include such networks.

(1) Note. In many of the devices in this and the indented subclass, the electrical wave energy is converted into mechanical energy which is transmitted to a means for reconverting the mechanical energy to electrical wave energy. The mechanical energy transmitting means may be a bar, rod, fluid, etc. The mechanical transmission member determines the frequency of the energy transmitted.

SEE OR SEARCH THIS CLASS, SUBCLASS:

148+, for delay networks of the electromechanical transducer type which are analogous to wave filters.

SEE OR SEARCH CLASS

178, Telegraphy,

49, for telegraph systems utilizing vibrating elements for transmitting undulating currents. 181, Acoustics,

207+, for mufflers and sound filters, see subclass 207 for rods designed to transmit mechanical vibrations and to damp out other mechanical vibrations and designed to act as mechanical filters.

310, Electrical Generator or Motor Structure,

311+, for piezoelectric devices; and subclass 26 for the miscellaneous magnetostrictive devices.

318, Electricity: Motive Power Systems,

118, for magnetostrictive motors; and subclass 116 for piezoelectric motors.

322, Electricity: Single Generator Systems, in the appropriate subclasses for electromechanical transducers of the motor generator type.

323, Electricity: Power Supply or Regulation Systems,

201, 204 for dynamoelectric systems.

330, Amplifiers,

174, for amplifier systems having an electromechanical transducer coupling element; magnetostrictive means in an amplifier system are classified in subclass 60.

331, Oscillators, appropriate subclasses particularly 73, 116, 139, and 154+ for oscillators employing an electromechanical resonator or transducer as an element thereof.

336, Inductor Devices,

20, for inductors having magnetostrictive structure.

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

141, for underwater vibration transducers.

381, Electrical Audio Signal Processing Systems and Devices,

337+, for telephone transmitters and receivers with mechanical sound amplifying means (e.g., harmonic vibrators); and subclasses 190 and 355+ for telephone transmitters and receivers using magnetostrictive effects.