US PATENT SUBCLASS 340 / 537
.~.~.~ With impedance level coding

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
531  DF  .~ With particular coupling link {3}
533  DF  .~.~ Wired {4}
537.~.~.~ With impedance level coding

DEFINITION

Classification: 340/537

With impedance level coding:

(under subclass 533) Subject matter where the sensor or transmitter output is encoded by selection of specifically related impedance.

(1) Note. Graded or binary coded decimal coding for analog signals are found in Class 340, subclass 870.27 for telemetering systems.