Pressure-indicative container closure

Details Pressure-indicative container closure Pressure-indicative container closure

1985-08-19

1987-06-23

Norton, Donald F.

Bottles and jars

Closures

Including visual indicia

215270, 215350, B65D 4104

Patent

active

046746420

ABSTRACT:
A container closure includes liner adapted to seal a container having contents under vacuum pressure, and a closure member securing the liner thereto about the liner periphery. An interior extent of the liner is thereby permitted movement relative to the closure member, i.e., is not secured to the closure member. At the point of container initial closure, the liner interior extent is withdrawn under vacuum pressure from its theretofore normal self-biased disposition adjacent the closure member to within the upper neck of the container and is deformed to the extent that initial container pressurization occasions. Upon loss of such initial vacuum pressure, the liner interior extent moves into its normal self-biased disposition adjacent the closure member. Discernment of the disposition of the liner interior extent relative to the closure member is thus indicative of whether the initial vacuum pressure is being maintained or has been lost.

REFERENCES:
patent: 2068389 (1937-01-01), Smith
patent: 2458360 (1949-01-01), Fay et al.
patent: 2582489 (1952-01-01), Krueger
patent: 2634014 (1953-04-01), Kimber
patent: 3053407 (1962-09-01), Lowen
patent: 3458077 (1969-07-01), Ryan
patent: 3917100 (1975-11-01), Dukess
patent: 4442946 (1984-04-01), MacDonald et al.
patent: 4489844 (1984-12-01), Breskin

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