Patent ID: 7188937

Claim:
A printing-fluid container, comprising: a reservoir; an air-interface on the reservoir; and an internal fluid-air separation assembly located entirely inside the reservoir and fluidically coupled to the air-interface, wherein the separation assembly is configured to block escape of printing fluid through the air-interface and to allow movement of air through the air-interface into the reservoir, the separation assembly comprising: a vent chamber at least partially formed by a frame member that extends inwardly into the reservoir and having a trough portion therein that is configured to be air permeable and printing-fluid impermeable, a first membrane that is air permeable and printing-fluid impermeable attached to the frame and covering at least a portion of the trough portion, and a second membrane that is air permeable and printing-fluid impermeable attached to the frame and positioned opposite the first membrane, wherein the frame member and the second membrane collectively define a supplemental chamber that is in fluid communication with the vent chamber.