US PATENT SUBCLASS 178 / 19.07
.~.~.~.~ Multifrequency

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}
19.01  DF  .~.~ Writing digitizer stylus {5}
19.06  DF  .~.~.~ AC source {1}
19.07.~.~.~.~ Multifrequency

DEFINITION

Classification: 178/19.07

Multifrequency:

(under subclass 19.06) Subject matter wherein the pointing device has means for transmitting an alternating current of different frequencies to the circuitry present in the sensing surface of the tablet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

66.1, for alternating current transmission.