Binder with observation window

Details Binder with observation window Binder with observation window

1990-07-23

1991-05-14

Phan, Hien H.

Books, strips, and leaves

Book, element thereof, or accessory therefor

Sealed

281 151, 281 31, 281 51, B42D 300

Patent

active

050150111

ABSTRACT:
A binder having an observation window characterized by a bubble structure. The window is constructed inside an aperture which is die cut into a support board. Transparent cover sheets are depressed into the aperture and heat-sealed together along a relatively narrow track adjacent the edge of the panel aperture. A bubble is defined by an air pocket formed interiorly of the sealing boundary.

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patent: 4832369 (1989-05-01), Johnson et al.
patent: 4838724 (1989-06-01), Spence, Jr.
patent: 4848798 (1989-07-01), Moor
patent: 4934584 (1990-06-01), Wyant

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