US PATENT SUBCLASS 330 / 284
.~.~ Having attenuation means in signal transmission path

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

Internet Version by PATENTEC © 1999      Terms of Use


330 /   HD   AMPLIFIERS

250  DF  WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21}
278  DF  .~ Including gain control means {4}
284.~.~ Having attenuation means in signal transmission path

DEFINITION

Classification: 330/284

Having attenuation means in signal transmission path:

(under subclass 278) Subject matter having attenuation means in signal transmission path that controls the gain of the amplifier.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52, for amplifiers having pilot frequency control means.

143, for amplifiers having thermally responsive means.

144+, for amplifiers having variable impedance for signal channel controlled by separate control path.

SEE OR SEARCH CLASS

455, Telecommunications,

249.1, for gain-controlled receiver having variable impedance in the control circuit.