US PATENT SUBCLASS 455 / 333
.~.~.~ Transistor or integrated circuit


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

Internet Version by PATENTEC © 1999      Terms of Use



455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
313  DF  .~ Frequency modifying or conversion {4}
323  DF  .~.~ Particular frequency conversion structure or circuitry {5}
333.~.~.~ Transistor or integrated circuit


DEFINITION

Classification: 455/333

Transistor or integrated circuit:

(under subclass 323) Systems wherein the frequency conversion means comprises an active element, three or more terminal device or devices constructed of a semiconductor material having a specific resistance, for example, of the order of that of germanium, silicon, selenium, etc. (e.g., transistor).

(1) Note. For specific types of receivers which may include semiconductor devices, see the pertinent subclass relating to the particular special type receiver in this class.

SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), appropriate subclasses integrated circuit structure with active solid-state devices,

446, and 499+ for integrated circuit devices with electrically isolated components, in general, and other appropriate subclasses for specific type devices in integrated circuits.

329, Demodulators, appropriate subclasses for demodulators using a discrete semiconductor device.

330, Amplifiers,

250+, for amplifiers with transistors.

331, Oscillators,

108+, for oscillators utilizing transistor type active element.

348, Television,

659+, for natural color television with mixing.