[The first paragraph of this note covers all of the Libers of Patent Assignments in Record Group 241.]
Patent assignments were generally forwarded to the U.S. Patent Office, where they were copied into the Libers of Patent Assignments. A summary was entered into the Digest of Patent Assignments, and the original document was then returned to the assignee. These Edison-related assignments, which cover the years 1868-1876, pertain primarily to inventions in telegraphy. Also included is an assignment relating to Edison's electric pen.
This patent was assigned by Edison to Dewitt C. Roberts on April 28, 1868.