US PATENT SUBCLASS 381 / 358
.~.~.~.~ Plural or variable characteristics

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

Internet Version by PATENTEC © 1999      Terms of Use


381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
355  DF  .~ Housed microphone {4}
356  DF  .~.~ Directional {1}
357  DF  .~.~.~ With plural sound ports (e.g., pressure gradient) {1}
358.~.~.~.~ Plural or variable characteristics

DEFINITION

Classification: 381/358

Plural or variable characteristics:

(under subclass 357) Subject matter having a) two or more switchable discrete directional response patterns, or b) a single response pattern which is continuously variable.