Collapsible and inflatable piston for two- or multi- compartment

Details Collapsible and inflatable piston for two- or multi- compartment Collapsible and inflatable piston for two- or multi- compartment

1987-12-09

1989-10-31

Shaver, Kevin P.

Dispensing

With discharge assistant

Container with follower

222389, B67D 542

Patent

active

048771562

ABSTRACT:
A collapsible and inflatable piston usable for containers and other receptacles for packaging requiring fluid-tight separation of the packaged product and the propellant by the piston, particularly for aerosol containers, the piston being formed from elastic material impermeable to gases and to liquids and includes a hollow cylindro-frustoconical vessel having a frustoconic cap closed at the top and extended by a cylindrical part open at the base. This cylindrical part has external sealing ribs mating a container in fluid-tight manner.

REFERENCES:
patent: 3255936 (1966-06-01), Healy et al.
patent: 3362589 (1968-01-01), Kinnavy
patent: 3381863 (1968-05-01), Towns
patent: 3901416 (1975-08-01), Schultz
patent: 3915352 (1975-10-01), Scheindel
patent: 3997124 (1975-11-01), Kifer
patent: 4023717 (1977-05-01), Schultz
patent: 4109833 (1978-08-01), Gross
patent: 4234108 (1980-11-01), Diamond
patent: 4271991 (1981-06-01), Diamond
patent: 4671431 (1987-06-01), Obrist
Plastics Materials; Brydson, Whitefriars Press, 1966; P. 224.

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