US PATENT SUBCLASS 181 / 286
.~.~ Specific acoustical properties or dimensions

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

Internet Version by PATENTEC © 1999      Terms of Use


181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
284  DF  .~ Sound absorbing panels {8}
286.~.~ Specific acoustical properties or dimensions

DEFINITION

Classification: 181/286

Specific acoustical properties or dimensions:

(under subclass 284) Subject matter whose composition, size or shape is related to a particular type of acoustic wave attenuation, e.g., insertion loss, transmission loss, or specific acoustic structure (Helmholtz resonator, 1/4 wavelength chamber depth).