US PATENT SUBCLASS 340 / 630
.~.~.~.~.~ Photoelectric

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  DF  .~.~.~.~ Smoke {2}
630.~.~.~.~.~ Photoelectric

DEFINITION

Classification: 340/630

Photoelectric:

(under subclass 628) Subject matter wherein the sensor is a photodetector responsive to the optical properties of smoke.

SEE OR SEARCH CLASS

250, Radiant Energy,

573.1+, for photocell actuated, fluent material detecting circuit.

356, Optics: Measuring and Testing,

438+, for an optical transmission or absorption smoke measuring device.