US PATENT SUBCLASS 340 / 509
.~.~.~ Plural or diverse current sources

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
501  DF  .~ With particular system function (e.g., temperature compensation, calibration) {8}
506  DF  .~.~ Alarm system supervision {7}
509.~.~.~ Plural or diverse current sources

DEFINITION

Classification: 340/509

Plural or diverse current sources:

(under subclass 506) Subject matter having plural, or diverse current sources, with the supervisory current typically being imposed on the primary alarm circuit.

(1) Note. Systems using polarity reversal are not classified herein, but are usually classified in subclass 513.