US PATENT SUBCLASS 257 / 595
VOLTAGE VARIABLE CAPACITANCE DEVICE

Current as of: June, 1999
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257 /   HD   ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES)

595VOLTAGE VARIABLE CAPACITANCE DEVICE {6}
596  DF  .~> With specified dopant profile {1}
598  DF  .~> With plural junctions whose depletion regions merge to vary voltage dependence
599  DF  .~> With means to increase active junction area (e.g., grooved or convoluted surface)
600  DF  .~> With physical configuration to vary voltage dependence (e.g., mesa)
601  DF  .~> Plural diodes in same non-isolated structure, or device having three or more terminals
602  DF  .~> With specified housing or contact

DEFINITION

Classification: 257/595

VOLTAGE VARIABLE CAPACITANCE DEVICE:

(under the class definition) Subject matter wherein the active solid-state device has a capacitance which varies with the voltage applied thereto.

(1) Note. This type of voltage variable capacitor device is to be distinguished from voltage variable capacitors (also referred to as varactors) which are passive devices only and which may be found, for example, in Class 361, Electricity: Electrical Systems and Devices, subclass 277, and Class 332, Modulators, subclass 136, modulators with varactors.

SEE OR SEARCH THIS CLASS, SUBCLASS:

312, for insulated gate type voltage variable capacitor devices or voltage variable capacitor devices combined with an insulated gate transistor.

438, Semiconductor Device Manufacturing: Process, subclass 379 for methods of forming a voltage variable capacitance device utilizing a semiconductor substrate.

480, for a voltage variable capacitor diode with a Schottky barrier.