US PATENT SUBCLASS 359 / 169
.~.~.~ Retroreflection

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  DF  .~.~ Passive system {1}
169.~.~.~ Retroreflection

DEFINITION

Classification: 359/169

Retroreflection:

(under subclass 168) Subject matter wherein the transmitted response to a received optical beam is transmitted in the opposite direction of the received beam to ensure that the original transmitter receives the response.