Binder with observation window

Details Binder with observation window Binder with observation window

B - Operations, Transporting

42

F

B42F 7/00 (2006.01) B42F 13/00 (2006.01) B42F 13/40 (2006.01)

Patent

CA 2045075

Abstract Of The Disclosure 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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