US PATENT SUBCLASS 340 / 579
.~.~.~ By ionization or conductivity

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}
579.~.~.~ By ionization or conductivity

DEFINITION

Classification: 340/579

By ionization or conductivity:

(under subclass 577) Subject matter wherein the flame is detected by passage of current therethrough due to its ionizing properties.

SEE OR SEARCH THIS CLASS, SUBCLASS:

629, for ionization-type smoke detectors.