This folder contains correspondence and other documents relating to foreign and domestic patent applications, assignments, litigation, and legislation. Included are statements of invention by H. H. Meno Kammerhoff concerning the technical development of Edison's storage battery and its application to portable lamps and miners' safety lamps. There are also items pertaining to proposed changes in U.S. patent and tariff laws, including a questionnaire from the President's Commission on Economy and Efficiency regarding improvements in the U.S. Patent Office.

Approximately 40 percent of the documents have been selected. The items not selected include receipts, letters of inquiry, routine correspondence concerning patent attorneys and standing accounts, and documents that duplicate information in selected material.