US PATENT SUBCLASS 178 / 18.04-- .~.~.~ Acoustical (e.g., vibration, ultrasonic, etc.)

US PATENT SUBCLASS 178 / 18.04
.~.~.~ Acoustical (e.g., vibration, ultrasonic, etc.)

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}
18.03	DF	.~.~ Writing digitizer pad {6}
18.04		.~.~.~ Acoustical (e.g., vibration, ultrasonic, etc.)

DEFINITION

Classification: 178/18.04

Acoustical (e.g., vibration, ultrasonic, etc.):

(under subclass 18.03) Subject matter wherein position coordinates are determined by a property (e.g., type, material, temperature, or structure of connection) of a device, designed to transform an acoustical signal (e.g., vibration, ultrasonic waves, or the like) into an electrical signal, that is included in the sensing surface of the tablet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

19.02, for an acoustical writing digitizer stylus.

47, for harmonic or vibratory transmission systems and essential accessories.

SEE OR SEARCH CLASS

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

177, for a combination of a display device and a writing digitizer pad with acoustic detection for position coordinate determination.

367, Communications, Electrical: Acoustic Wave Systems and Devices, 99+, for distance or direction finding and cross-reference art collection 907 for coordinate determination.