US PATENT SUBCLASS 359 / 168
.~.~ Passive system

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

109  DF  OPTICAL COMMUNICATION {13}
154  DF  .~ Transmitter and receiver system {15}
168.~.~ Passive system {1}
169  DF  .~.~.~> Retroreflection

DEFINITION

Classification: 359/168

Passive system:

(under subclass 154) Subject matter wherein the receiver derives its power to activate itself from the beam transmitted by the transmitter.

(1) Note. The received light beam is the source for the receiver.

SEE OR SEARCH THIS CLASS, SUBCLASS:

154, for an active system.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers,

310, for an electrical switch together with details of the indicators; Dig. 47 light guide for indicators.

250, Radiant Energy, 227.11+, for shutter type optical switches.