A dispensing container comprising a compressible bottle having a neck portion, a cap attached to the neck portion, the cap having an inlet extending through the cap, a first one-way valve disposed in the inlet and operable to permit flow of air through the inlet into the bottle, the cap having an outlet...http://www.google.com.au/patents/US4159790?utm_source=gb-gplus-sharePatent US4159790 - Dispensing container
