US PATENT SUBCLASS 178 / 19.06-- .~.~.~ AC source

US PATENT SUBCLASS 178 / 19.06
.~.~.~ AC source

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		.~.~.~ AC source {1}
19.07	DF	.~.~.~.~> Multifrequency

DEFINITION

Classification: 178/19.06

AC source:

(under subclass 19.01) Subject matter wherein the pointing device has means for transmitting an alternating current (AC) to circuitry present in the sensing surface of the tablet.

(1) Note. An alternating current is a flow of electricity which reaches maximum in one direction, decreases to zero, then reverses itself and reaches maximum in the opposite direction. The cycle is repeated continuously.

SEE OR SEARCH THIS CLASS, SUBCLASS:

66.1, for alternating current transmission.