Binder with observation window
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United States of America Patent
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May 14, 1991
Grant Date -
N/A
app pub date -
Jul 23, 1990
filing date -
Jul 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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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