What was Thomas Edison’s first patented invention?

Thomas Edison’s first patented invention was the electric vote recorder.

Edison received U.S. Patent No. 90,646 for the device in 1869. The machine was designed for legislative bodies: lawmakers could press switches to record “yes” or “no” votes electrically, rather than answering a roll call aloud.

Although the invention worked, it was not commercially successful. Legislators often preferred the delay and debate created by traditional voting procedures. The experience taught Edison to concentrate on inventions with a clear market demand.

The vote recorder is sometimes confused with Edison’s later stock ticker, which brought him greater financial success. It also predates his best-known inventions, including the phonograph and practical incandescent lighting.