US PATENT CLASS 181
Class Notes
Current as of: June, 1999
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DEFINITION
Classification: 181/
This class includes devices and corresponding methods for mechanically transmitting, for amplifying and for ascertaining the direction of sound and for mechanically muffling or filtering sound, and not elsewhere provided for.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS
73, Measuring and Testing,
572+, and especially 645+ for the determination of qualities, characteristics or conditions by the utilization of acoustical energy and which is not specifically provided for elsewhere.
84, Music, appropriate subclasses for musical instruments.
109, Safes, Bank Protection, or a Related Device,
21.5, for partitions having a sound transmitting passage constructed to prevent passage of projectiles.
116, Signals and Indicators, appropriate subclasses, for mechanical signaling devices utilizing sound. 178, Telegraphy, appropriate subclasses, for acoustic instruments limited to that art.
333, Wave Transmission Lines and Networks,
141+, for electrical delay networks wherein the electrical waves may be converted to sound waves, such sound waves being delayed and reconverted to electrical waves, and subclasses 186+ for wave filters of the electromechanical transducer type, wherein electrical waves may be converted to sound waves, such sound waves being filtered and reconverted to electrical waves.
352, Optics: Motion Pictures,
1+, for "taking" motion picture apparatus.
367, Communications, Electrical: Acoustic Wave Systems and Devices, for electrical signaling devices utilizing sound or
compressional waves.
369, Dynamic Information Storage or Retrieval, for an information storage or retrieval device having particular acoustical structure.
379, Telephonic Communications, appropriate subclasses, for acoustic instruments limited to that art.
381, Electrical Audio Signal Processing Systems and Devices, appropriate subclasses for one-way electrical transmission of audio signals.
434, Education and Demonstration, particularly
300, on teaching acoustic principles. 446, Amusement Devices: Toys,
175, for a toy having sound responsive switch or control.
472, Amusement Devices, particularly
64, for an amusement device causing an illusion by sound imitation or effect.
505, Superconductor Technology: Apparatus, Material, Process,
150+, for high temperature (Tc 30 K) superconducting devices, and particularly subclass 203 for electroacoustic transducers.