US PATENT SUBCLASS 178 / 20.04
.~.~.~ Phase detecting

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}
20.04.~.~.~ Phase detecting

DEFINITION

Classification: 178/20.04

Phase detecting:

(under subclass 20.01) Subject matter wherein position coordinates are determined by a circuit that discriminates the phase of the position coordinate input signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, subclasses 2+ for a miscellaneous phase detecting circuit.

341, Coded Data Generation or Conversion, subclass 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, subclasses 173+ for a combination of a display device and a writing digitizer pad, a stylus, or circuitry for position coordinate determination.