Envelopes – wrappers – and paperboard boxes – File folder or file envelope – Hanging type
Patent
1976-02-02
1977-09-20
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
File folder or file envelope
Hanging type
B65D 3114
Patent
active
040491919
ABSTRACT:
A block bottom valve bag comprises an elongated bag tube having opposite ends. One end of the bag is folded to form a block bottom closure comprising first and second side flaps folded toward one another in overlapping relationship and adhered to one another, and a pair of end flaps extending inwardly beneath the side flaps at the opposite ends thereof. An elongated valve member extends between one of the end flaps and overlapped side flaps. The valve member comprises an elongated flexible valve tube collapsed into a flat configuration having upper and lower walls in facing relation. The upper wall is operatively secured to the interior surfaces of the side flaps and the lower wall of the valve tube is operatively secured adjacent one end thereof to the end flap and is detachably secured adjacent the other end thereof to the end flap. A reinforcing sheet member may be interposed between and adhered to the under surface of the side flaps and the upper surface of the valve tube.
REFERENCES:
patent: 2490966 (1949-12-01), Johnsson
patent: 3000551 (1961-09-01), Atwood
patent: 3040967 (1962-06-01), Klein
patent: 3261267 (1966-07-01), Becker
patent: 3378190 (1968-04-01), White
patent: 3724461 (1973-04-01), Eisenberg
patent: 3734154 (1973-05-01), Polk
patent: 3894682 (1975-07-01), Harmsen
Garbe Stephen P.
Great Plains Bag Corporation
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