Éleuthère Irénée du Pont de Nemours known as Irénée du Pont, or E.I. du Pont, was a French-born American chemist and industrialist who emmigrated to the United States in 1799 and founded the gunpowder manufacturing business, E. I. du Pont de Nemours and Company. His descendants, the centuries Du Pont family, were one of America's richest and most prominent families in the nineteenth and twentieth.
Source: https://www.newworldencyclopedia.org/entry/Eleuthere_Irenee_du_Pont
On June 24 of the year 1873, U.S. Patent No.: 140,245 issued to Samuel L. Clemens for an "Improvement in Scrap-Books". Clemens is better known by his pseudonym, "Mark Twain", which was a meausure of water depth used by steamboat pilots on the Mississippi River to indicate two fathoms. In addition to being a well-known writer, humorist, publisher, and lecturer, Twain was an inventor who held three patents. The '245 patent was his second and, by far, his most successful patent.
Source:
http://www.patentlyinteresting.com/june-24.html
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