US PATENT SUBCLASS 340 / 578
.~.~.~ By radiant energy

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
577  DF  .~.~ Flame {2}
578.~.~.~ By radiant energy

DEFINITION

Classification: 340/578

By radiant energy:

(under subclass 577) Subject matter wherein the presence of a flame is detected by radiation emitted therefrom.

SEE OR SEARCH CLASS

250, Radiant Energy,

554, for prephotocell systems with a flame light source.