US PATENT SUBCLASS 178 / 20.01
.~.~ Writing digitizer circuit

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.~.~ Writing digitizer circuit {3}
20.02  DF  .~.~.~> Electrical filter or multiplexer
20.03  DF  .~.~.~> Sampling circuit
20.04  DF  .~.~.~> Phase detecting

DEFINITION

Classification: 178/20.01

Writing digitizer circuit:

(under subclass 18.01) Subject matter including the interconnection of a number of electrical elements in one or more closed paths to perform the transformation of inputted position coordinates data into planar coordinate information that can be read and understood by a computer.

(1) Note. A writing digitizer circuit 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.

74+, for subcombinations of systems or local circuit arrangements under the class definition not amounting to systems nor specific to any particular type of system.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers,

512+, for a membrane-type solid contact relating to a switch of a touchpad. 340, Communications: Electrical,

407.1, for a tactual indicator.

341, Coded Data Generation or Conversion,

5, for X - Y coordinate determination in a digital pattern reading-type converter, 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, and subclasses 126+ for analog to or from digital converters.

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.