US PATENT SUBCLASS 250 / 351
.~.~ With periodic beam varying 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}
351.~.~ With periodic beam varying means

DEFINITION

Classification: 250/351

(under subclass 338.1) Subject matter having means to change at regular intervals some characteristic of the infrared radiation in the path of the radiation from the source to the signalling means.