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Abraham Lincoln's patent is a patented 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. ==Background== 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.〔(【引用サイトリンク】title=Lincoln's Patent )〕 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.〔 As William Horman first wrote, "necessity is the mother of invention." Before Offutt's flatboat could reach the Illinois River, it got hung up on a milldam at the Old Sangamon town. As the boat was sinking, Lincoln took action, unloading some cargo to right the boat, then drilling a hole in the bow with a large auger borrowed from the local cooperage. After the water drained, he replugged the hole. With local help, he then portaged the empty boat over the dam, and was able to complete the trip to New Orleans.〔 At the age of 23, Lincoln started his political career in New Salem. Near the top of his agenda was improvement of navigation on the Sangamon River. Lincoln's law partner and biographer, William H. Herndon, also reports an additional incident at the time: a boat Lincoln was on got stranded on a shoal; the boat gradually swung clear and was dislodged after much manual exertion.〔 This event, along with the Offutt's boat/milldam incident, prompted Lincoln to start thinking about how to lift vessels over river obstructions and shoals. He eventually came up with an idea for inflatable flotation.Patent 6469 was awarded to Abraham Lincoln on May 22, 1849. Called "Buoying Vessels Over Shoals," Lincoln envisioned a system of waterproof fabric bladders that could be inflated when necessary to help ease a stuck ship over such obstacles. When crew members knew their ship was stuck, or at risk of hitting a shallow, Lincoln's invention could be activated, which would inflate the air chambers along the bottom of the watercraft to lift it above the water's surface, providing enough clearance to avoid a disaster. As part of the research process, Lincoln designed a scale model of a ship outfitted with the device. This model (built and assembled with the assistance of a Springfield, Ill., mechanic named Walter Davis) is on display at the Smithsonian Institution. After reporting to Washington for his two-year term in Congress (beginning March 1847), Lincoln retained Zenas C. Robbins, patent attorney.〔 Robbins most probably had drawings done by Robert Washington Fenwick, his apprentice artist. Robbins processed the application,〔 which became patent No. 6,469 on May 22, 1849. However, it was never produced for practical use.〔〔 There are doubts as to whether it would have actually worked: It "likely would not have been practical," stated Paul Johnston, curator of maritime history at the National Museum of American History, "because you need a lot of force to get the buoyant chambers even two feet down into the water. My gut feeling is that it might have been made to work, but Lincoln's considerable talents lay elsewhere."〔 About that time, Lincoln took his son Robert Todd to the Old Patent Office Building model room to view the displays, sowing one of the youngster's fondest memories.〔 Lincoln himself continued to have a special affinity for the site. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Abraham Lincoln's patent」の詳細全文を読む スポンサード リンク
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