Vacuum-indicating closure for containers

Details Vacuum-indicating closure for containers Vacuum-indicating closure for containers

1987-05-27

1988-08-23

Norton, Donald F.

Bottles and jars

Closures

Including visual indicia

215271, B65D 4104

Patent

active

047654988

ABSTRACT:
A closure for a container of food or the like sold under vacuum comprises a domed lid of sheet material and a screw-top cover adapted to hold the lid in sealing engagement over the mouth of the container. The top panel of the cover has a central opening up into which extends in depressible fashion a button having a flange about its base, the flange being retained between the lid and cover. When the closure is applied to a product under vacuum, the dome of the lid is drawn down. The button will appear "down," and it will feel down and not depressible. If vacuum is lost, the dome is up, and the button will appear "up" and will feel "up" and depressible. Further, when pressed, the button causes the lid to snap or "oil can" audibly to indicate loss of vacuum.

REFERENCES:
patent: 2449014 (1948-09-01), Shaffer
patent: 3160302 (1964-12-01), Chaplin
patent: 3930592 (1976-01-01), Dilanni
patent: 4093094 (1978-06-01), Smalley et al.
patent: 4398491 (1983-08-01), Fridl et al.
patent: 4674642 (1987-06-01), Towns et al.

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