US PATENT SUBCLASS 178 / 19.05
.~.~.~ Light pen

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}
19.05.~.~.~ Light pen

DEFINITION

Classification: 178/19.05

Light pen:

(under subclass 19.01) Subject matter wherein the pointing device is a light sensitive device which consists of an optical lens and a photocell with associated circuitry mounted in a tubular housing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

18.09, for optical writing digitizer pad.

SEE OR SEARCH CLASS

250, Radiant Energy,

227.13+, for a light pen, per se.

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

180+, for a combination of a display device and a light pen.