Expansible envelope

Details Expansible envelope Expansible envelope

1997-05-27

1998-09-01

Pascua, Jes F.

Envelopes, wrappers, and paperboard boxes

Envelope

229 673, B65D 2700

Patent

active

057998620

ABSTRACT:
An expansible envelope structure with a single fold bottom is provided with gusset side walls having stress relief score lines in the lower ends thereof which permit normal expansion of the gusset panels.

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