Air-evacuated package with vacuum integrity indicator means

Details Air-evacuated package with vacuum integrity indicator means Air-evacuated package with vacuum integrity indicator means

1980-05-07

1981-10-20

Dixson, Jr., William T.

Special receptacle or package

With ornamentation or simulation

73 492, 116266, 116270, 2065248, B65D 8120, G01L 1912

Patent

active

042955661

ABSTRACT:
An evacuated article-containing package assembly with a vacuum integrity indicator comprises an air-impervious package having an access opening and having at least a flexible portion. An article is included inside the package. A member is included inside the package which is compressible under the influence of pressure less than atmospheric pressure. A closure seal is on the package for sealing the access opening, with the sealed package being air-evacuated. The compressible member is adapted to expand against the flexible portion of the package to outwardly expand the flexible portion if the pressure inside the package equalizes with the pressure outside the package. When this occurs, the expanded flexible portion serves as a visual indicator that there is no vacuum condition inside the package.

REFERENCES:
patent: 2821951 (1958-02-01), Carver
patent: 3238599 (1966-03-01), Bauman
patent: 3374882 (1968-03-01), Amaliksen
patent: 4054204 (1977-10-01), Keeton

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