Hewlett-packard Development Company, L.P.

Seth Stephen Haddix

Daniel D Dowell

Ronald J Ender

Alexander N Govyadinov

Ronald Albert Askeland

Craig L Malik

Blair A Butler

Jeffrey F Bell

Si-Lam J Choy

Jon A Crabtree

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

A printing fluid pen includes a plurality of fluid ports, a pressure regulator in fluid communication with a first fluid port, and a valve in fluid communication with a second fluid port. The first fluid port is to deliver printing fluid to a fluid ejection device, and the second fluid port is to direct printing fluid out of the pen. In response to negative pressure, the valve is to open to enable fluids within the pen to exit via the second port.

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Corvallis, OR, United States of America

Seth Stephen Haddix