.~ Acoustic, nonairborne vibration sensing or counterwave emission
DEFINITION
Classification: 381/71.2
Acoustic, nonairborne vibration sensing or counterwave emission:
(under subclass 71.1) Subject matter which senses vibration from or which imparts a cancelling wave directly to a solid or liquid medium or structure.
(1) Note. In order to be properly classifiable here, the primary object should be attenuation of acoustic sounds. In most cases, this will mean that a sensor such as a microphone will be needed to detect sound propagated through air, such as the residual sound after the counterwave source's output has been acoustically summed with the original noise.
SEE OR SEARCH CLASS
52, Static Structures (e.g., Buildings),
167.1, + for means compensating for an earth-transmitted force, i.e., earthquake.
267, Spring Devices,
136+, for resilient shock or vibration absorbers. See especially subclasses 140.14 and 140.15 for subject matter including electronic or magnetic control, or subclass 140.11 for subject matter having an energy absorbing feature.
