An elastic squeeze bottle which springs back to shape after collapse by squeezing, contains a viscous product and has a normally closed valve opened by the displaced product and which automatically closes again when the squeezing is terminated. So that air can enter the bottle to replace the displaced...http://www.google.es/patents/US4314658?utm_source=gb-gplus-sharePatente US4314658 - Viscous product dispensing squeeze bottle having a self-venting automatic shut-off valve
Viscous product dispensing squeeze bottle having a self-venting automatic ...
