Envelopes – wrappers – and paperboard boxes – File folder or file envelope – Hanging type
Patent
1976-06-21
1978-02-14
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
File folder or file envelope
Hanging type
B65D 3114
Patent
active
040734293
ABSTRACT:
A plastics-film bag having one wall formed by overlapping panels joined by a longitudinal seal, and having a filling valve constituted by a passageway left between the panels, in which at least one additional layer of film or other flexible material is included between the panels in the overlap, to improve the security of the valve.
REFERENCES:
patent: 2040338 (1936-05-01), Rosmait
patent: 3746246 (1973-07-01), Murray
patent: 3812769 (1974-05-01), Barnes et al.
patent: 3833166 (1974-09-01), Murray
Garbe Stephen P.
Imperial Chemical Industries Limited
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