公开(公告)号：WO2019078843A1

公开(公告)日：2019-04-25

申请号：PCT/US2017/057160

申请日：2017-10-18

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： ROURKE, Kevin ,  CHIEW, Kelvin ,  LOW, Tong Nam Samuel ,  KINAS, Erick Blane ,  MANNION, James ,  RONALDSON, Joe

IPC: G03G15/08 ,  G03G15/10

CPC classification number: G03G15/086 ,  G03G15/105

Abstract: A print agent vessel is disclosed that comprises a circuit, the circuit comprising a first electrically conductive portion to couple to a first terminal of a printing device, a second electrically conductive portion to couple to a second terminal of the printing device, and an electrically conductive component capacitively coupled to the first electrically conductive portion. The circuit has a variable capacitance that is indicative of a parameter of the component.