US PATENT SUBCLASS 340 / 384.4
.~ Electronic siren (e.g., wail tone or yelp tone warning device)

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

384.1  DF  AUDIBLE INDICATION {11}
384.4.~ Electronic siren (e.g., wail tone or yelp tone warning device)

DEFINITION

Classification: 340/384.4

Electronic siren (e.g., wail tone or yelp tone warning device):

(under subclass 384.1) Subject matter wherein the audible signalling means includes a source for generating audio frequency electrical signals having a rising and falling pitch and a transducer for converting the signals into the produced audible sounds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

404.1, for pneumatic siren sound producer.

SEE OR SEARCH CLASS

116, Signals and Indicators,

147, for nonelectrical siren.