Three section envelope blank

The ornamental design for a three section envelope blank, as shown and described.

FIG. 1 is a plan view in flat unfolded state, of a three section envelope blank, showing my new design the rear surface which is plain;

FIG. 2 is a plan view of a modification thereof in which sections for printed matter are shown in a portion thereof;

FIG. 3 is a perspective view of the three section envelope blank in a partial stage of folding thereof; and

FIG. 4 is a perspective view of the completely folded three section envelope blank.

Patent	Priority	Assignee	Title
D285454,	Jan 23 1984		Envelope blank
D335303,	Jul 26 1991		Envelope
D474504,	Jun 04 2002		Open communicator mailer
D483064,	Jun 04 2002		Open communicator mailer
D499760,	Feb 22 2002	Imation Corporation; Imation Corp	Adhesive perforated sheet for a printed CD wallet
D583409,	Feb 23 2005	Rotoform Ltd.	One piece self seal cut sheet mailer forms
D591341,	Feb 23 2005	Rotoform Limited	One piece self seal cut sheet mailer form
D858632,	Mar 09 2018		Document holder

Patent	Priority	Assignee	Title
2985464,
3837565,
3977597,	Oct 07 1975	Federal Business Products, Inc.	One piece, two-way mailer

Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Feb 02 1979		AB Sture Ljungdahl	(assignment on the face of the patent)

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