US PATENT SUBCLASS 178 / 20.02
.~.~.~ Electrical filter or multiplexer

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2 R  DF  SYSTEMS {21}
18.01  DF  .~ Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry) {4}
20.01  DF  .~.~ Writing digitizer circuit {3}
20.02.~.~.~ Electrical filter or multiplexer

DEFINITION

Classification: 178/20.02

Electrical filter or multiplexer:

(under subclass 20.01) Subject matter including an electrical element that can separate signals in accordance with specified criteria or that can accomplish simultaneous transmission of two or more signals over a common transmission medium.

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

551+, for a circuit including a filtering device to eliminate undesired signals.

341, Coded Data Generation or Conversion,

5, for X - Y coordinate determination in a digital pattern reading-type converter and subclasses 20+ for bodily actuated code generators in which an operator makes physical contact to control the transmission or generation of a coded set of pulses.

345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems,

173+, for a combination of a display device and a writing digitizer pad, a stylus, or circuitry for position coordinate determination. 370, Multiplex Communication, appropriate subclasses for a circuit including a multiplexer.