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Non-gusseted expansible envelope

  • US 4,294,400 A
  • Filed: 04/17/1980
  • Issued: 10/13/1981
  • Est. Priority Date: 04/17/1980
  • Status: Expired due to Term
First Claim
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1. A non-gusseted expansible envelope comprising a one piece blank including a substantially rectangular rear panel, a front panel foldably attached thereto along a transverse fold line, a closure flap foldably attached to the front panel along another transverse fold line and two pairs of equally sized and shaped side seam flaps foldably attached respectively to the side edges of the front and rear panels along a pair of longitudinal fold lines, the improvement wherein the side seam flaps attached to the side edges of the front panels are each applied with longitudinal perforated lines which substantially bisect the flaps to form outer portions for the application of adhesive and to provide hinge connections which enable the side seam flaps to be folded inwardly upon themselves when the envelope is expanded.

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