Nikola Tesla German Patent 73080 - Process for Generating Electrical Light Patent added February 13, 2020 - 11:15 AM
Nikola Tesla British Patent 8575 - Improved Methods of and Apparatus for Generating and Utilizing Electric Energy for Lighting Purposes Patent added February 10, 2019 - 12:17 PM
Nikola Tesla British Patent 1877 - Improvements in Electric Lamps Patent added December 17, 2018 - 11:26 AM
Nikola Tesla U.S. Patent 447,920 - Method of Operating Arc-Lamps Patent added March 1, 2015 - 12:21 AM