US PATENT SUBCLASS 340 / 628
.~.~.~.~ Smoke

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}
603  DF  .~.~ Fluent material {7}
627  DF  .~.~.~ Particle suspension in fluid {2}
628.~.~.~.~ Smoke {2}
629  DF  .~.~.~.~.~> Ionization
630  DF  .~.~.~.~.~> Photoelectric

DEFINITION

Classification: 340/628

Smoke:

(under subclass 627) Subject matter wherein particle suspension is in a gas, and is generally the result of combustion.

SEE OR SEARCH THIS CLASS, SUBCLASS:

577, for the detection of a flame.

584, for the detection of smoke by the thermal properties thereof.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers,

61.03, for a smoke operated switch.