# US 10,369,801 B2 · Liquid propelling component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,369,801 B2 - Document ID: US10369801B2 - Status: Granted - Kind: B2 - Application number: 15/522,340 - Filed: 2014-11-25 - Published: 2017-11-16 - Granted: 2019-08-06 - Earliest claimed: 2014-11-25 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: Vincent C Korthuis; David Maxfield; Andrew Queisser - Web page: https://patentgrep.com/patent/US10369801B2 ## CPC - B41J 2/17543: {Cartridge presence detection or type identification} - B41J 2/17546: {electronically} - B41J 2/17566: {Ink level or ink residue control} - B41J 2002/17579: {Measuring electrical impedance for ink level indication} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract A liquid propelling component includes a liquid channel, a circuit block. The circuit block includes a first conductor disposed in the liquid channel to be in contact with liquid in the channel and a second conductor insulated from liquid in the channel. The liquid propelling component further includes a memory storing a digital code that corresponds to an analog value of the second conductor under a predefined charge. ## Claims ### Claim 1 A liquid propelling component, comprising an array of liquid channels to guide liquid; circuitry to at least one of propel and analyze liquid, the circuitry comprising: a corresponding array of sensing circuit blocks comprising first and second terminals, the first terminal disposed in at least one of the liquid channels of the array to be in contact with liquid in the at least one liquid channel and a second terminal insulated from liquid in the at least one liquid channel; an engine to charge the terminals according to a predefined charge value and read an analogue value of at least the second terminal; and a memory storing a digital code that corresponds to the analogue value of the second conductor under the predefined charge. ### Claim 2 (depends on 1) The liquid propelling component of claim 1, the memory further storing the predefined charge value. ### Claim 3 (depends on 1) The liquid propelling component of claim 1, wherein: the engine is further to: read the analogue values of both conductors; and convert the analogue values to corresponding digital values; and the circuitry further includes at least one communication interface, the communication interface to communicate the digital values to a host device. ### Claim 4 (depends on 1) The liquid propelling component of claim 1, wherein the engine is to charge both conductors of the circuit block according to the same charge value. ### Claim 5 (depends on 1) The liquid propelling component of claim 1, wherein the corresponding array of sensing circuit blocks include impedance sensing circuits and the analogue value is impedance. ### Claim 6 (depends on 1) The liquid propelling component of claim 1, wherein the corresponding array of sensing circuit blocks each include ground terminals. ### Claim 7 (depends on 1) The liquid propelling component of claim 1, comprising, separate from the circuit blocks, liquid propelling resistors to propel the liquid. ### Claim 8 A liquid propelling component, comprising a plurality of liquid channels; a plurality of circuit blocks, each block including: a liquid sensing circuit comprising a first conductor n a liquid channel to contact liquid; and a reference sensing circuit comprising a second conductor insulated from the liquid; a read-only memory storing: charge values for charging each of the second conductors; and a plurality of digital codes corresponding to analogue values of the second conductors when induced according to said charge values; and an engine to: charge the conductors using the stored charge values; read analogue values of the conductors of each circuit block; and convert the analogue values to digital codes. ### Claim 9 (depends on 8) The liquid propelling component of claim 8, wherein each sensing circuit includes a ground to allow impedance sensing between the respective conductor and the ground. ### Claim 10 (depends on 8) The liquid propelling component of claim 8, comprising, separate from the circuit blocks, liquid propelling resistors to propel the liquid. ### Claim 11 (depends on 8) The liquid propelling component of claim 8, comprising: at least one of a communication interface and a power interface, and a liquid source to supply liquid to the liquid channels, wherein the liquid propelling component is a replaceable cartridge for connection to a host device. ### Claim 12 (depends on 11) The liquid propelling component of claim 11, wherein: the liquid propelling component is an integrated printhead inkjet cartridge for connection to a host device; and the liquid source comprises ink. ### Claim 13 A liquid propelling component, comprising: a liquid channel to guide liquid; circuitry comprising: a sensing circuit block comprising a first terminal disposed in the liquid channel to be in contact with liquid in the liquid channel and a second terminal insulated from liquid in the liquid channel; an engine to: charge the first terminal and the second terminal according to a predefined charge value; and read an analogue value of the second terminal; and a memory storing a digital code that corresponds to the analogue value of the second terminal under the predefined charge. ### Claim 14 (depends on 13) The liquid propelling component of claim 13, comprising: an array of liquid channels; and a corresponding array of first and second conductors, wherein the first and second conductors are terminals of sensing circuits. ### Claim 15 (depends on 14) The liquid propelling component of claim 14, wherein each sensing circuit includes a ground to allow impedance sensing between the respective conductor and the ground. ### Claim 16 (depends on 13) The liquid propelling component of claim 13, wherein: the first conductor is part of a liquid sensing circuit; and the second conductor is part of a reference sensing circuit. ### Claim 17 (depends on 13) The liquid propelling component of claim 13, comprising: liquid propelling resistors that propel liquid separate from the circuit blocks. ### Claim 18 (depends on 13) The liquid propelling component of claim 13, comprising: at least one of a communication interface and a power interface, and a liquid source to supply liquid to the liquid channels, wherein the liquid propelling component is a replaceable cartridge for connection to a host device. ### Claim 19 (depends on 13) The liquid propelling component of claim 13, wherein the memory is a read-only memory and the engine comprises a register to store the charge value in operation.