US Patent 7708391 Inkjet printer cartridge refill dispenser with plunge action

A printing fluid dispenser that has a housing with first and second portions, the first portion being displaceable relative to the second portion. A quantity of printing fluid is contained in the housing and a resilient member deforms in response to displacement of the first portion relative to the second portion to apply pressure to the printing fluid such that it dispenses from an outlet. The first portion has a maximum displacement relative to the second portion, which is designed to correspond with a maximum possible pressure applied by the resilient member to the printing fluid.