This folder contains material pertaining to the infringement suit brought by Edison and the North American Portland Cement Co. against Alsen's American Cement Works in the U.S. District Court for the Southern District of New York. The case was initiated in March 1908 and involved Edison's U.S. Patent 802,631 on long kilns. The court decided against Edison and declared his patent invalid on May 7, 1913. The following items from the complainant's record and brief have been selected:

Complainants' Record on Final Hearing

Index

Bill of Complaint

Testimony of Walter S. Mallory and Emil Herter

Complainants' Paper Exhibits 44, 46-53 (Edison drawings)

Complainants' Brief on Final Hearing

Summary and Index of Complainants' Argument