Envelopes – wrappers – and paperboard boxes – Paperboard box – Window or transparent portion
Patent
1989-06-07
1990-10-23
Wlkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Window or transparent portion
206 4531, 428192, B65D 2554
Patent
active
049645633
ABSTRACT:
This invention is related to a manufacturing process of covering foils of packing boxes extending over at least one edge of the box. The process comprises the steps of cutting slots in a film (3) of rigid transparent material, of glueing a film (4) of flexible transparent plastic material to the prepared film, and of cutting covering foils from the resulting composite material. This invention is also related to the foils made in this way and to the packing boxes provided with such covering foils for the windows.
REFERENCES:
patent: 3273702 (1966-09-01), Palmer
patent: 3301143 (1967-01-01), Palmer
patent: 4545483 (1985-10-01), Shiba et al.
patent: 4664648 (1987-05-01), Dupuy
patent: 4733916 (1988-03-01), Seufert
patent: 4817347 (1989-04-01), Hand et al.
patent: 4826004 (1989-05-01), Dupuy
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