United States Patent and Trademark Office​ 0462795 – July 16, 1891 – Method Of Producing Rain-Fall 803180 – October 31, 1905 – Means for Producing High Potential Electrical Discharges 1103490 – August 6, 1913 – Rain-Maker … Leggi tutto EXTENSIVE LIST OF PATENTS (FROM 1891 TO 2023)