Patent ID: 8449088

Claim:
A method of making a print cartridge comprising: providing an ink housing having a top and a base and at least one interior compartment, the housing further having a passageway in the base with an entrance in the compartment to allow fluid communication between an interior of the compartment and a print head mounted at the base of the housing, inserting a block of hydrophobic foam material under compression into the compartment immediately above the passageway entrance, inserting two hollow needles through the foam block so a first needle terminates closer to a first edge of the passageway entrance than a second edge of the passageway entrance opposite the first edge, and a second needle terminates closer to the second edge than the first edge; injecting an ink into the foam block through the needles, a total volume of ink injected by the needles being sufficient to fill the passageway and cover the passageway entrance but insufficient to reach all sidewalls of the foam block in a final state of the print cartridge.