(under subclass 321) Subject matter wherein the mechanical energy applied to or produced by the resonant structure is disclosed as being caused by or producing traveling compressions in an elastic material.
(1) Note. The combination of a piezoelectric element and a cavity resonator is included in this subclass even though the wave is a "standing wave" rather than a traveling wave.
(2) Note. Since devices which produce or receive acoustic waves can sometimes be structurally similar to mechanically coupled devices, the search notes for subclasses 323 and 328 should be consulted.
SEE OR SEARCH THIS CLASS, SUBCLASS:
334, and 335, for acoustic wave devices that don't necessarily use a resonant structure.
SEE OR SEARCH CLASS
47, Plant Husbandry, Digest 12 for ultrasonic generators which may utilize a piezoelectric element.
68, Textiles: Fluid Treating Apparatus, 3, for use of supersonic energy in washing machines.
73, Measuring and Testing,
67+, and 522 for piezoelectric transducers which couple an alternating current, electric circuit and a device having mechanical vibrations for testing purposes.
99, Foods and Beverages: Apparatus,
451, and Digest 12 for use of supersonic energy in food processing.
116, Signals and Indicators,
137+, Digests 18 and 19 for acoustic wave signaling devices, e.g., noise makers.
134, Cleaning and Liquid Contact With Solids,
1, and 17 for processes of cleaning or fluid treatment of solids which may include the application of ultrasonic energy.
166, Wells,
177, and 249 for processes and apparatus to apply acoustic or vibrational energy to the material surrounding a well bore. 181, Acoustics,
.5, 106, 108, 113, 139, and 142 for acoustic wave generators and detectors.
200, Electricity: Circuit Makers and Breakers,
61.01, and Digest 20 for acoustically actuated switches.
210, Liquid Purification or Separation,
738, for processes or apparatus involving coagulation by ultrasonic vibrations, and subclass 542 for apparatus for coagulating suspensions utilizing piezoelectric means.
340, Communications: Electrical,
870.30, for piezoelectric transmitters, and subclasses 384.1+ for electrically driven noise makers.
366, Agitating,
127, for apparatus for agitating which utilize piezoelectric means.
367, Communications, Electrical: Acoustic Wave Systems and Devices,
140+, for piezoelectric transducers used in electrical acoustic wave communication; and subclasses 197+ for sound responsive selective devices.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
20, and 127+ for process and apparatus using acoustic wave generating means.
600, Surgery,
437+, for systems using acoustic or vibratory energy for medical treatment or diagnosis.
601, Surgery: Kinesitherapy,
46+, for systems using acoustic or vibratory energy for medical treatment or diagnosis.
