| May 20 | Executes a successful patent application for an automobile starter motor and battery. |
| Aug 12 | Appoints Miller Reese Hutchison chief engineer of the West Orange laboratory, replacing Donald Bliss. |
| Aug 16 | The U.S. Department of Justice initiates an anti-trust suit against the Motion Picture Patents Co. |
| c. Sep 11 | Along with six employees, begins an intensive campaign to perfect the process for the mass production of disc records; the group works night and day for five weeks and becomes known as the "Insomnia Squad." |
| Sep 19 | Announces his support for Progressive party candidate Theodore Roosevelt in the upcoming presidential election and comes out in favor of women's suffrage. |
| Oct 7 | Begins shipment of Blue Amberol cylinder machines and records to phonograph dealers. |
| Oct | The disc phonograph is exhibited at the Boston Electric Show; by the end of the year, it is being marketed throughout the United States. |
| Nov 9 | Frank Dyer resigns as president of Thomas A. Edison, Inc.; Edison subsequently assumes the presidency of his company and remains in that position until 1926. |
| Nov 29 | Signs an agreement with Henry Ford for a loan of $500,000 to construct a new factory to manufacture storage batteries for Ford automobiles; over the next two and one half years, Ford lends Edison $1,200,000. |
| Nov | Begins marketing the home projecting kinetoscope. |
