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 about Edison's Canadian phonograph patent and the lapsing of some of his telegraph and phonograph patent applications. There is also correspondence about patent litigation between the American Graphophone Co. and the United States Phonograph Co.

All of the documents have been selected except for 8 letters of transmittal from the law firms of Dyer & Seely and Dyer & Driscoll.