US PATENT SUBCLASS 250 / 353
.~.~ With beam deflector or focussing means

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

336.1  DF  INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING {16}
338.1  DF  .~ Infrared responsive {12}
353.~.~ With beam deflector or focussing means

DEFINITION

Classification: 250/353

(under subclass 338.1) Subject matter having means to change the path of the infrared radiation from its source to the signalling means or to cause the radiation to converge.