Hewlett-packard Development Company, L.p.

Jon A Crabtree

Yubai Bi

Alex Veis

Gregg A Lane

Rio Rivas

George Sarkisian

Eric Lee Nikkel

Daniel D Dowell

Yi-Hua Tsao

Ronald J Ender

Bradley D Chung

Elizabeth Ann Visnyak

Siddhartha Bhowmik

Lawrence E Gibson

Jeffrey F Bell

Max Yen

Samson Berhane

Benjamin H Wood

Seth Stephen Haddix

John M Watanabe

Louis C Ramsay

Orestes Alejandro Bihun

Maria Alexeevna Kabalnova

Jessica Rikki Vosler

Marisa Weaver

An example printing fluid pen comprises a plurality of fluid ports, including an inlet port to direct fluid from a fluid reservoir to a fluid ejection device, and a recirculation port to direct fluid from the fluid ejection device out of the inkjet pen. The example pen also includes a plurality of parallel fluid pressure regulators fluidly coupled with the inlet port, each of the plurality of parallel fluid pressure regulators to receive fluid from the inlet fluid port.

Printing fluid circulation

In one example, a process to solidify a water-based printing fluid printed on a substrate includes flushing nonvolatile solvent in the printing fluid into the substrate with the water in the printing fluid.

Solidifying water-based printing fluid

An example of a liquid bonding agent, for a liquid ink including a wax emulsion in an amount less than 1% actives, includes a calcium salt, the wax emulsion, an acetylenic surfactant, a glycol, and a balance of water. The wax emulsion is present in the liquid bonding agent in an amount ranging from greater than 0% actives to about 2% actives. The liquid bonding agent is to be digitally printed with a thermal inkjet printhead on a substrate under the liquid ink.

Liquid bonding agent for liquid ink

Fluid flux correction is disclosed. An example method of fluid flux correction includes displacing a fluid volume in a fluid reservoir with a compliant element. The method also includes absorbing fluid surges caused by variations in fluid flux to reduce distortion of at least one ink nozzle meniscus and maintain consistent fluid ejection.

Fluid flux correction

A printing device () including a substrate () having an aperture () extending therethrough, wherein the aperture includes a side wall and defines a liquid ink flow path, an ink firing chamber () fluidically connected to the aperture, and a coating positioned on the side wall of the aperture, the coating being impervious to etching by liquid ink, and wherein the coating is chosen from one of silicon dioxide, aluminum oxide, hafnium oxide and silicon nitride.

Printing device

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San Diego, CA, United States of America

Jon A Crabtree