US PATENT SUBCLASS 327 / 568
.~ Negative resistance type

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

524  DF  SPECIFIC IDENTIFIABLE DEVICE, CIRCUIT, OR SYSTEM {22}
568.~ Negative resistance type {4}
569  DF  .~.~> Unijunction transistor
570  DF  .~.~> Having "N"-shape curve on I-V plot (e.g., tunnel diode type, etc.)
571  DF  .~.~> Having "S"-shape curve on I-V plot (e.g., pnpn diode type, etc.)
572  DF  .~.~> Secondary emissive type {1}

DEFINITION

Classification: 327/568

Negative resistance type:

(under subclass 524) Subject matter wherein an electron space discharge device or a solid-state device included in the nonlinear circuit has a negatively sloped portion in its current-voltage characteristic plot in which an increase in voltage results in a decrease in current.

(1) Note. Some examples of negative resistance tubes are the dynatron and the transitron.

SEE OR SEARCH CLASS

331, Oscillators,

115, for negative resistance semiconductor oscillators and subclasses 132+ for oscillatory circuits utilizing a negative resistance or negative transconductance tube means.

333, Wave Transmission Lines and Networks,

213+, for negative resistance or reactance networks of the active element type comprising a two terminal network.