초록 ▼

A variable size envelope with a single closure flap that may be selectively folded along either of two different fold lines to provide two different sizes of envelopes. A pocket for holding papers or other documents may be formed by a single rear panel or two rear panels joined together. The height

A variable size envelope with a single closure flap that may be selectively folded along either of two different fold lines to provide two different sizes of envelopes. A pocket for holding papers or other documents may be formed by a single rear panel or two rear panels joined together. The height of the closure flap is preferably equal to the height of the panels so that the envelope when folded into a smaller size presents a flat envelope of uniform thickness which may be processed through automatic mechanical printing equipment, laser printing equipment and copying machines, then unfolded and later used as a larger size envelope. Adhesive strips are provided on the closure flap for the purpose of sealing the envelope. The adhesive used for the strips is preferably a stable, water-activated, or moisture-activated adhesive, which is not significantly affected by either heat or exposure to high humidity facilitating use of the envelope during laser printing or xerographic copying. A stable, pressure-sensitive adhesive covered by a peel-off strip may also be used for the adhesive strips on the closure flap.

대표청구항 ▼

A variable size envelope comprising a front panel joined to at least one rear panel to form a pocket and a closure flap joined to said front panel, said closure flap having a height approximately equal to a height of said rear panel, said closure flap having a first fold line adjacent a top of said

A variable size envelope comprising a front panel joined to at least one rear panel to form a pocket and a closure flap joined to said front panel, said closure flap having a height approximately equal to a height of said rear panel, said closure flap having a first fold line adjacent a top of said rear panel, said closure flap adapted to be folded along said first line to provide a flat, small envelope of approximately uniform thickness facilitating processing through printing and copying equipment, said closure flap having a second fold line located between a top of said closure flap and said top of said rear panel, said envelope adapted to be unfolded from said small envelope so that said closure flap may be folded along said second fold line to provide a flat, large envelope larger in size than said small envelope.