template to print address in the envelope window

The window permits text on the letter itself to be used simultaneously as the address of the recipient and the return-address of the sender, reducing the need to print the addresses onto the envelope itself, which at the time of Callahan's invention was done with the aid of a typewriter. Callahan also recommends the use of black paper, which would likewise provide an opaque background whilst simultaneously increasing the contrast with the white address blocks. Ĭallahan specifically recommended the use of Manila paper, which is considerably cheaper than thicker writing paper and also provides an opaque background for secure covering of the letter within. The United States patent number for Callahan's design is 701,839. The design and patent letter were completed on 15 November 1901, with the patent filing occurring on 9 December 1901. The design has otherwise remained nearly unchanged. Originally called the 'outlook envelop', the patent initially anticipated using thin rice paper as the transparent material forming the window, though this material has since been replaced by clear plastics. Callahan of Chicago, Illinois, in the United States, received the first patent for a windowed envelope on 10 June 1902.

Modern envelope with a single window for the recipient addressĪ windowed envelope is a conventional envelope with a plastic (typically film or BOPS Bi-oriented polystyrene films) window to allow the recipient's address to be printed on the paper contained within.Īmericus F.

Template to print address in the envelope window