US PATENT SUBCLASS 219 / 499
.~.~.~.~ Including bridge means

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

Internet Version by PATENTEC © 1999      Terms of Use


219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
482  DF  .~ With power supply and voltage or current regulation or current control means {4}
490  DF  .~.~ Automatic regulating or control means {11}
497  DF  .~.~.~ Comprising voltage and/or current measuring and comparing or combining means {2}
499.~.~.~.~ Including bridge means

DEFINITION

Classification: 219/499

(under subclass 497) Subject matter wherein the voltage or current measuring or comparison structure includes or comprises resistance or capacitance bridge means.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

663+, position servo-mechanisms utilizing potentiometers as position measuring instruments, the potentiometers may take the form of a wheatstone bridge circuitry.