On Aug. 13, 1889 William Gray of Hartford, Connecticut, received a patent for a coin-operated telephone. Soon he formed the Gray Telephone Pay Station Company to market his invention.
The invention popularized the telephone. It made it possible to use the telephone in a public manner in public places.
The first public coin telephone was installed by inventor William Gray at a bank in Hartford, Conn. The earliest coin-operated phones were post-pay phones. Users paid coins after the call was made.
Publication number: US408709 A
Patent Title: Coin-controlled apparatus for telephones
Publication type: Grant
Publication date: 13 Aug 1889
Filing date: 13 Aug 1888
Inventors: William Gray