A 1993 New Yorker story by John Seabook called The Flash of Genius is being made into a movie starring Greg Kinnear. The story revolves around Bob Kearns, the inventor of the intermittent windshield wiper and his struggle to get the US auto industry to pay him for infringing on his patent. "There's no question that Dr. Kearns' wiper circuit was interesting. He had a three-brush motor, with dynamic brake and intermittent on one speed only -- his system was a concatenation of a lot of different ideas. But we figured there was just no way in the world it was patentable. An electronic timing device was an obvious thing to try next. How can you patent something that is in the natural evolution of technology?"
BTW, the phrase "flash of genius" refers to a test of patentability enacted in 1941 saying that the act of invention had to be a "flash of creative genius" on the part of the inventor and not the result of tinkering. That standard was replaced in 1952 by the non-obviousness test.
