First Patent Invention

However, the most interesting aspect of this journey is the start. The first ever patent issued by the United States Patents Office was on July 31, 1790. The patent was issued in the name of Samuel Hopkins of Philadelphia, Pennsylvania, for his invention of an apparatus and process for making Potash and Pearl ash. None other than George Washington, the first US President signed on the patent document while it was endorsed by Attorney General Edmund Rudolph and Thomas Jefferson, who was the Secretary of State.

Potash and Pearl ash are both impure forms of potassium carbonate. Potash was extensively used during 18th century for the purpose of manufacturing soaps, glass and saltpeter. It was also used for dyeing fabrics and baking purpose. In the modern era, potash is primarily used as a fertilizer for plants. Potash is primarily obtained by burning the barks of hardwood trees and certain other plants. As a result, many countries started depleting their timber resources and were looking for different ways of manufacturing potash. In this regard, the invention of Samuel Hopkins was important as it revolutionized the process of making potash. The objective of Hopkins’ innovation was to extract as much potash as possible from raw ash without burning excess wood. Hopkins’ patent remained in existence for fourteen years. During this period, potash was sold at a price of $200-300 per ton. As a result of this innovation, the United States remained the world’s leading producer of potash till 1860s before mining started from the rich natural deposits in Stassfurt, Germany.