Sift proof valve bag

Details Sift proof valve bag Sift proof valve bag

1998-08-24

1999-10-19

Pascua, Jes F.

Flexible bags

With closure

Self-closing type

383 53, 383109, 383114, 383125, B65D 3026

Patent

active

059676647

ABSTRACT:
A valved bag is provided, having first and second end portions, and at least one in-folded flap member and at least one outer flap member affixed to at least one of the first and second end portions. A cover member is positioned and affixed to the in-folded flap member and outer flap member, prior to final closure of same, for preventing the undesired escape of material from within the bag, subsequent to closure of the ends and filling of the bag.

REFERENCES:
patent: 2078467 (1937-04-01), Sterling
patent: 2147970 (1939-02-01), du Bois
patent: 3130897 (1964-04-01), Poklukar et al.
patent: 3191850 (1965-06-01), Niemeyer
patent: 3237534 (1966-03-01), Lissner
patent: 3261267 (1966-07-01), Becker
patent: 3397622 (1968-08-01), Goodwin
patent: 3448666 (1969-06-01), Kappelhoff et al.
patent: 4049191 (1977-09-01), Stearley
patent: 4367620 (1983-01-01), Fox
patent: 4391404 (1983-07-01), Welter
patent: 4453270 (1984-06-01), Donini et al.
patent: 4759640 (1988-07-01), Groener

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