Window envelope facts for kids
A window envelope is a special kind of envelope. It has a clear plastic "window" on the front. This window lets you see what's inside, like the address or a name. It helps people send mail without needing to write the address twice.
How Were Window Envelopes Invented?
The idea for the window envelope came from a person named Americus Callahan. He invented it and got a patent for his design in 1901. When he first created it, he called it an "outlook envelope."
What Materials Are Used for the Window?
When Americus Callahan first thought of the window envelope, he planned to use very thin rice paper for the clear part. But today, these envelopes use clear plastic. This plastic is strong and lets you see through it easily.
Images for kids
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US Patent 701,839 for a windowed envelope
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Window envelope Facts for Kids. Kiddle Encyclopedia.