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US Patent 701,839 for a windowed envelope Modern envelope with a single window for the recipient address. A windowed envelope is a conventional envelope with a transparent (typically PET or BOPS Bi-oriented polystyrene [1] plastic film) window to allow the recipient's address to be printed on the paper contained within.
The window is normally covered with a transparent or translucent film to protect the letter inside, as was first designed by Americus F. Callahan in 1901 and patented the following year. [2] In some cases, shortages of materials or the need to economize resulted in envelopes that had no film covering the window.
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See-through graphics on the outside of a window See-through graphics: the view outside is unobstructed. Perforated self-adhesive window films are often used to create see-through graphics. [1] A graphic is printed on the front side of the film which contains circular holes (perforations) covering up to fifty percent of the surface area.
A self-addressed stamped envelope (SASE), [1] [2] stamped self-addressed envelope (SSAE), [3] or stamped addressed envelope (SAE) [4] is an envelope with the sender's name and address on it, plus affixed paid postage, that is mailed to a company or private individual.
The simplest, least expensive package is a paper envelope. More expensive versions add a transparent window to the envelope allowing the disc label to be seen. [21] The envelope can also be made out of spun-bonded polyethylene (trade-named Tyvek) which is stronger and lighter than paper and is resistant to moisture. [22]
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