10082414 is referenced by 1 patents and cites 69 patents.

In some examples, an ink level sensor includes a sense capacitor between a first node and ground, a first switch to couple a first voltage to the first node and charge the sense capacitor, a second switch to couple the first node with a second node and share the charge between the sense capacitor and a reference capacitor, causing a second voltage at the second node, and a transistor having a drain, a gate coupled to the second node, and a source coupled to ground, the transistor to provide a drain to source resistance in proportion to the second voltage.

Title
Ink level sensing
Application Number
15/423266
Publication Number
10082414 (B2)
Application Date
February 2, 2017
Publication Date
September 25, 2018
Inventor
George H Corrigan III
Corvallis
OR, US
Neel Banerjee
Corvallis
OR, US
Joseph M Torgerson
Philomath
OR, US
Teck Khim Neo
Singapore
SG
Trudy Benjamin
Portland
OR, US
Ning Ge
Palo Alto
CA, US
Agent
HP Patent Department
Assignee
HEWLETT PACKARD DEVELOPMENT COMPANY
TX, US
IPC
B41J 2/14
B41J 2/175
G01F 23/26
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