| 摘要 |
A small hand-held pump-type dispenser for liquids such as perfumes which must be kept out of contact with the atmosphere comprises a rigid closed container (4), fitted with a single-acting suction- delivery pump (3) with a capillary dip tube, sealed without access to atmosphere and filled at least partially with a liquid (11) under a pressure which is not greater than atmospheric pressure. The void space may contain an inert gas. There is an increasing depression in the container as the liquid is dispensed. Preferably the pump has a capilliary dip tube of less than half the useful volume of the pump. <IMAGE> |
