US PATENT SUBCLASS 327 / 509
EXTERNAL EFFECT

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

509EXTERNAL EFFECT {5}
510  DF  .~> Magnetic {1}
512  DF  .~> Temperature {1}
514  DF  .~> Light {1}
516  DF  .~> Utilizing conversion of mechanical variations into electrical variations (e.g., vibration sensitive, etc.)
517  DF  .~> Responsive to proximity or touch

DEFINITION

Classification: 327/509

EXTERNAL EFFECT:

(under the class definition) Subject matter wherein the operation of the circuit or system depends upon some externally applied force or field such as radiation, light, heat, sound, mechanical pressure, etc., or where compensation for the effects of such externally applied force or field is provided.

SEE OR SEARCH THIS CLASS, SUBCLASS:

187, for two or more stable state circuits using external effect devices.

SEE OR SEARCH CLASS

73, Measuring and Testing, appropriate subclasses for sensing

various types of external influence such as, fluid pressure, vibration, etc.

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),

414+, for active solid-state devices, per se, responsive to a non-electrical signal. 307, Electrical Transmission or Interconnection Systems, appropriate subclasses (e.g.,

116+, 401+, 650+, etc.) for transmission or interconnection systems which are condition responsive.

438, Semiconductor Device Manufacturing: Process,

48+, for methods of making semiconductor devices which respond to nonelectrical stimuli.