US PATENT SUBCLASS 178 / 18.03
.~.~ Writing digitizer pad

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.~.~ Writing digitizer pad {6}
18.04  DF  .~.~.~> Acoustical (e.g., vibration, ultrasonic, etc.)
18.05  DF  .~.~.~> Resistive
18.06  DF  .~.~.~> Capacitive
18.07  DF  .~.~.~> Inductive {1}
18.09  DF  .~.~.~> Optical
18.11  DF  .~.~.~> With illumination

DEFINITION

Classification: 178/18.03

Writing digitizer pad:

(under subclass 18.01) Subject matter including a characteristic or a structure of the sensing surface of the tablet used to transform the inputted position coordinates data into planar coordinate information that can be read and understood by a computer.

(1) Note. A digitizer pad claimed with display device is classified in Class 345, subclass 173. Otherwise it is included in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

18.01, for writing position coordinate determination.

SEE OR SEARCH CLASS

340, Communications: Electrical,

407.1, for a tactual indicator.

341, Coded Data Generation or Conversion,

5, for X and 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.

364, Electrical Computers and Data Processing Systems,

190, for a positional input to a data processing control system and subclasses 709.01+ for an electric digital calculating computer using specialized input.