US PATENT SUBCLASS 318 / 640
.~.~ Photoelectric or optical-type measuring instruments

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
638  DF  .~ With particular "error-detecting" means {13}
640.~.~ Photoelectric or optical-type measuring instruments

DEFINITION

Classification: 318/640

(under subclass 638) Subject matter in which the error detector is a radiant energy photoelectric or optical measuring instrument.

SEE OR SEARCH THIS CLASS, SUBCLASS:

480, for open-loop automatic motor controls responsive radiant energy.

577, for photoeclectric line followers.

SEE OR SEARCH CLASS

250, Radiant Energy,

200+, for radiant energy devices and systems employing photocells.