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 1225521 – September 4, 1915 – Protecting From Poisonous Gas In Warfare 1279823 – September 24, 1918 - Process and Apparatus for Causing Precipitation by Coalescence of Aqueous…