Piston for pressurized container

Dispensing – With discharge assistant – Container with follower

Reexamination Certificate

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Details

C222S386000, C222S389000, C222S001000

Reexamination Certificate

active

06880732

ABSTRACT:
The structure of a piston design to be used in a pressurized dispensing container which dispenses product that is loaded at a higher temperature where it is highly flowable but maintained and dispensed at a lower temperature where it is highly viscous. The piston has an annular sidewall with an upper end that maintains a very close tolerance to the can in which it is used. The lower end has a smaller interference fit with the container. Between the upper and lower end is a recess zone that provides a more substantial clearance with the sidewall of the container.

REFERENCES:
patent: 2895650 (1959-07-01), Mahon et al.
patent: 3255936 (1966-06-01), Healy et al.
patent: 4355736 (1982-10-01), Schumacker et al.
patent: 4533069 (1985-08-01), Drobish
patent: 4913323 (1990-04-01), Scheindel
patent: 5360146 (1994-11-01), Ikushima
patent: 5419466 (1995-05-01), Scheindel
patent: 5441181 (1995-08-01), Scheindel
patent: 2 781 210 (2000-01-01), None

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