Hewlett-packard Development Company, L.P.

Declan O'Keeffe

Patrick Lynch

Darren Hackett

A print cartridge comprises an ink housinghaving at least one interior compartmentwith a print head mounted at the base of the housing in fluid communication with the compartment via a passagewayhaving an entrance above the bottom of the compartment. A compressed foam blocksubstantially fills the compartment above the passageway entrance so as to leave a free space laterally adjacent to the passageway. A ribextends upwardly along one wall of the compartment from the free space partially to the top of the foam block, the foam block not conforming fully to the cross-section of the rib to leave an air vent channel along at least one side of the rib.

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Kildare Letxtip, Ireland

Declan O'Keeffe