US PATENT SUBCLASS 340 / 388.3
.~.~ With auxiliary flexible membrane

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

384.1  DF  AUDIBLE INDICATION {11}
388.1  DF  .~ Diaphragm (e.g., horn or buzzer) {7}
388.3.~.~ With auxiliary flexible membrane

DEFINITION

Classification: 340/388.3

With auxiliary flexible membrane:

(under subclass 388.1) Subject matter wherein the sounds are

produced by the vibration of at least two diaphragms or by the vibration of a diaphragm and a resonator disc or plate secured to the diaphragm.

(1) Note. The two diaphragms are arranged in closely spaced parallel planes or in orthogonal planes.

SEE OR SEARCH CLASS

116, Signals and Indicators,

145, for nonelectrical parallel diaphragms.