The Invention of the Telephone Exhibit 2: Gray's Caveat Elisha Gray's caveat, as it was filed in the United States Patent Office, February 14, 1876 To all whom it may concern: Be it known that I, Elisha Gray, of Chicago, in the County of Cook, and State of Illinois, have invented a new art of transmitting vocal sounds telegraphically, of which the following is a specification: It is the object ...