LIRC@SFIT

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