Register USPTO Patent
Application Number 17781535
Status Pending
Filing Date 2019-12-06
First Publication Date 2023-01-26
Publication Date 2023-01-26
Owner Hewlett-Packard Development Company, L.P. (USA)
  • Lum, Jacob
  • Feinn, James A
  • Lu, Mengqian


An example recirculation fluid ejection device includes a first unit droplet generator including a first actuator and a first nozzle between a first and a second fluid feed hole, the first fluid feed hole located on a first channel and the second fluid feed hole and a first pump located on a second channel. The example device includes a second unit droplet generator including a second actuator and a second nozzle between a third and a fourth fluid feed hole, the third feed hole located on a third channel and the fourth fluid feed hole and a second pump located on a fourth channel. The first and the second actuators eject fluid at substantially the same backpressure. A first pressure measurable at an inlet of the first channel and the third channel are different from a second pressure measurable at an outlet of the second channel and the fourth channel.

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