US PATENT SUBCLASS 250 / 346
.~.~.~.~ Plural temperature sensitive signalling 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}
343  DF  .~.~ With means to transmission-test contained fluent material {2}
345  DF  .~.~.~ Plural beam/detector pairs {1}
346.~.~.~.~ Plural temperature sensitive signalling means

DEFINITION

Classification: 250/346

(under subclass 345) Subject matter wherein the signalling means includes a means that absorbs the incident infrared radiation and converts it to heat combined with electrical means having some electrical parameter (capacitance, resistance, etc.), that varies in response to the heat.