Water absorbing fluid dispenser

Details Water absorbing fluid dispenser Water absorbing fluid dispenser

1980-08-22

1982-09-21

Rolla, Joseph J.

Dispensing

With discharge assistant

Container with follower

128260, A61M 3100

Patent

active

043502717

ABSTRACT:
A fluid dispenser that operates by absorbing water is disclosed. The dispenser includes a rigid water permeable housing; a water insoluble, water swellable composition that fills a segment of the space within the housing, a lipophilic fluid charge that fills the remainder of the space within the housing and that is immiscible in the water-swellable composition, and an outlet through the housing that communicates with the fluid charge. In operation the water swellable composition absorbs water, expands, and in piston-like fashion displaces the fluid charge from the dispenser via the outlet.

REFERENCES:
patent: 3865108 (1975-02-01), Hartop
patent: 4203439 (1980-05-01), Theeuwes

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