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1. (WO2017189011) DETECTING FLUID LEVELS USING A VARIABLE THRESHOLD VOLTAGE

Pub. No.:    WO/2017/189011    International Application No.:    PCT/US2016/030255
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Sat Apr 30 01:59:59 CEST 2016
IPC: B41J 2/17
B41J 2/175
B41J 2/01
B41J 29/393
Applicants: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventors: ANDERSON, Daryl, E.
CUMBIE, Michael, W.
GARDNER, James, Michael
FISHER, Berkeley
Title: DETECTING FLUID LEVELS USING A VARIABLE THRESHOLD VOLTAGE
Abstract:
An example printing cartridge includes a sensing die including a plurality of sensing locations in thermal contact with a fluid container, an on-die controller to select a sensing location of the plurality of sensing locations to activate and to provide a variable threshold voltage, and a voltage comparator to compare a sensed voltage generated at a selected sensing location to the variable threshold voltage, and output time-based information based on the comparison, the time-based information representative of whether a fluid is present at a fluid level associated with the selected sensing location.