Since the first U.S. patent was issued in 1790, some 7.5 million inventions have received them. Every grade-schooler learns about the cotton gin, invented by Eli Whitney in 1793, and the incandescent light bulb, for which Thomas Edison received a patent in 1880. More than a century later, inventor Dean Kamen patented the Segway, a two-wheeled, self-balancing “human transporter.” … Back to Article
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