US PATENT SUBCLASS 359 / 170
.~.~ 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}
170.~.~ Retroreflection

DEFINITION

Classification: 359/170

Retroreflection:

(under subclass 154) 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.