US PATENT SUBCLASS 340 / 583
.~.~.~ 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}
580  DF  .~.~ Ice formation {3}
583.~.~.~ Photoelectric

DEFINITION

Classification: 340/583

Photoelectric:

(under subclass 580) Subject matter wherein the ice formation is detected by modification of light incident on an electrical photo responsive device.