Patent ID: 11938727
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 13:
14. A fluid-ejection device comprising:
a device layer having a backside;
a chamber layer fluidically connected to the device layer and comprising;
a thermal resistor that is fired to eject fluid through a nozzle;
a microfluidic pump at the chamber layer to recirculate the fluid on-demand prior to firing of the thermal resistor; and
a macrofluidic pump to continuously recirculate the fluid through the chamber layer, through the device layer, at the backside of the device layer, through both the chamber layer and the device layer, or both through the chamber layer and at the backside of the device layer,
wherein the fluid has a concentration of solids greater than 12% by volume.