Patent ID: 8091993

Claim:
An inkjet cartridge including a collapsible ink reservoir, the inkjet cartridge comprising: a basin member having a peripheral annular rim, a middle section displaced relative to the rim of the basin member and an annular wall disposed obliquely relative to the middle section and sloping from the middle section outwardly relative to the ink reservoir, to the rim and integrally connected with the rim and middle section; a flexible membrane having a peripheral edge affixed to the rim of the basin member; a moveable plate wherein the flexible membrane is also affixed to the moveable plate and wherein the basin member, the flexible membrane, and the moveable plate define the collapsible ink reservoir; a spring-biased mechanism, disposed between the basin member and the plate, for biasing the plate away from the basin member thereby generating a negative pressure within the ink reservoir and the basin member remains stationary relative to the movement of the plate; and, wherein the flexible membrane is substantially flush with the annular sloped wall of the basin member and the moveable plate is substantially flush with the floor of the basin member in the ink reservoir when the ink reservoir collapses from ink depletion of ink from the ink reservoir.