A History of the Bar Code

In 1949, a young graduate student was wrestling with the concept of automatically capturing information about a product. He believed that the dots and dashes of Morse code would be a good model, but he could not figure out how to use those familiar patterns to solve his problem. Then, one day as he relaxed at the beach, he idly drew dots and dashes in the sand. As his fingers elongated the dashes he looked at the result and said, "Hey, I've got it." Three years later that graduate student, Joseph Woodland, and his partner received a patent on what began as lines in the sand, and the linear bar code was born. Today, the best-known and most widespread use of bar codes has been on consumer products. The Universal Product Code, or U.P.C., is unique because the user community developed it. Most technological innovations are first invented and then a need is found for the invention. The U.P.C. is a response to a business need first identified by the US grocery industry in the early 1970s. (For more information, see “A History of the Bar Code” at the Economic History Association online and "How UPC Bar Codes Work" at How Stuff Works online.