Abstract: A method and apparatus for manufacturing window envelopes is provided. After an opening has been cut in an envelope blank and glue applied around the opening, a window patch is secured over the opening and a panel secured behind the window patch. The panel serves as the rear panel of a pocket portion formed behind the window. When the envelope blank is folded and glued into its intended form, it will include both a relatively large compartment and a relatively small pocket. The window patch and pocket panel are cut from webs traveling at unequal speeds and transferred to an envelope blank through the use of cylinders having suction means therein. The patch and panel are carried by a first cylinder which rotates them to a position where they are adjacent a second cylinder. At this point, suction within the first cylinder is terminated so that the suction means within the second cylinder will draw the patch and panel thereto.

Abstract: A multiple compartment envelope is provided with each envelope adapted to carry identical information on their respective exteriors with a single writing. The envelopes are joined along their longitudinal edges and perforated along the joint for easy separation. Each envelope includes a flap with an appropriate adhesive for sealing purposes. After the user has deposited the desired contents into each envelope, one of the flaps may be folded to close the first envelope. This envelope is then folded along the perforated joint so that it lies above the other envelope. The flap of the other envelope is provided with a backing of carbon paper. This flap is folded over so that it contacts the back of the first envelope. Information written upon the flap will accordingly be carried upon both envelopes with a single writing. The envelopes may then be unfolded and sealed with the flaps. They are then separated along the perforation. An integral blank for forming the multiple compartment envelope is also disclosed.