Abraham Lincoln's patent

No. 6,469 patent for "Buoying Vessels Over Shoals"
Patent Model of Abraham Lincoln's invention at Smithsonian Institution
Creator	Abraham Lincoln
Filing date	March 10, 1849
Issue date	May 22, 1849
Location	Illinois

Abraham Lincoln's patent is a patent for an invention to lift boats over shoals and obstructions in a river. It is the only United States patent ever registered to a President of the United States. Lincoln conceived the idea of inventing a mechanism that would lift a boat over shoals and obstructions when on two different occasions the boat on which he traveled got hung up on obstructions. Documentation of this patent was discovered in 1997.

This device was composed of large bellows attached to the sides of a boat that was expandable due to air chambers. His successful patent application led to his drafting and delivering two lectures on the subject of patents while he was President. Lincoln was at times a patent attorney and was familiar with the patent application process as well as patent lawsuit proceedings. Among his notable patent law experiences was litigation over the mechanical reaper; both he and his future Secretary of War, Edwin Stanton, provided counsel for John Henry Manny.

The invention stemmed from Lincoln's experiences ferrying travelers and carrying freight on the Great Lakes and some midwestern rivers. In 1860, Lincoln wrote his autobiography and recounted that while in his late teens he took a flatboat down the Ohio and Mississippi Rivers from his home in Indiana to New Orleans while employed as a hired hand. The son of the boat owner kept him company and the two went out on this new undertaking without any other helpers.

After moving to Macon County, Illinois, Lincoln made an additional trip a few years later on another flatboat that went from Beardstown, Illinois, to New Orleans. He, John D. Johnston (his stepmother's son) and John Hanks were hired as laborers by Denton Offutt to take a flatboat to New Orleans. They were to join Offutt at Springfield, Illinois. In early March 1831, the boys purchased a large canoe and traveled south on the Sangamon River. When they finally found him, they discovered Offutt had failed to secure a contract for a freight trip in Beardstown. Thus, purchasing the large canoe was an unnecessary expense. They then tried to cut their losses and worked for Offutt for twelve dollars per month cutting timber and building a boat at the Old Sangamon town (fifteen miles northwest of Springfield) on the Sangamon River. The new boat carried them to New Orleans based upon the original contract with Offutt.