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US 5,207,250 AGranted
Pollutant-proof contractible container
OwnerYe-Ming Tsaoinventor
Life of this patent
Estimating the term…
Abstract
A container having a contractible body for storing a liquid is provided with a nonreturn valve in a neck outlet to permit dispensing of the liquid from the container while preventing external air or liquid from flowing into the container in order to preserve the freshness of any residual liquid. The collapsibility of the container provides indication of any residual liquid volume and plural empty containers may be joined together to minimize space occupancy and facilitating recycling.
Claims4
A pollutant-proof container comprising:
- a) an annular contractible container body including a neck portion defining an outlet;
- b) a nonreturn valve disposed in the neck portion for closing and opening the outlet, the valve including a displaceable convex portion having a plurality of outwardly protruding flaps therearound, a plurality of elastic plates for urging the convex portion into sealing engagement against the outlet, a plurality of fixed bars for restricting the displacement of the convex portion when liquid is dispensed from the outlet, and a cylindrical sucker tube carried by the convex portion for engagement with a vacuum pump tube for removing air and opening the valve during filling of the container with liquid.
Dependencies are inferred from the claim text.