This folder contains correspondence and other documents relating to patent applications and other patent matters. Most of the letters are by Edison's patent attorney, Lemuel W. Serrell. In addition to the correspondence, there are patent applications, assignments, and a caveat (preliminary application). Also included is an essay and a preliminary statement by Edison; a memorandum; and patent-related accounts, bills, and receipts.

Printed patents by Edison and by Eugenio de Zucatto, and duplicate copies of selected documents, have not been selected.