This folder contains correspondence and other documents from Edison's patent attorneys and agents relating to domestic and foreign patent applications, patent litigation, and other patent matters. Included are letters pertaining to patents for the kinetoscope, the phonograph, and ore milling machinery. There is also a translation of Charles Weyher's 1880 French patent on the phonograph. Most of the letters are by Richard N. Dyer and the law firm of Dyer & Driscoll.

Approximately 40 percent of the documents have been selected. The following categories of documents have not been selected: routine correspondence about patent interferences and renewals, application fees, taxes, and other routine transactions; letters of transmittal.