A dispenser for dispensing metered amounts of a viscous liquid includes a liquid reservoir and a pump chamber having an opening in communication with the reservoir. A dispensing orifice is defined in the pump chamber. A pump mechanism is configured with the pump chamber and is movable from a rest to...http://www.google.es/patents/US6516976?utm_source=gb-gplus-sharePatente US6516976 - Dosing pump for liquid dispensers
