When it comes to controller design, there truly is nothing new under the sun. You don't have to tell that to Nintendo -- the company has been sued (with varying success) over existing patents allegedly relating to the Wii Remote, the Gamecube controller and, uh, the Wii Remote again. Now, GamePolitics is reporting Nintendo is facing another lawsuit over the DS touchscreen.

In his complaint, John R. Martin alleges that the Nintendo DS infringes on his 2003-filed patent for a "Method for Operating an Electronic Machine Using a Pointing Device," (pictured above) which describes, among other things, a touchscreen input system. Nintendo, for its part, formally responded to the charges (PDF link) by saying it does not infringe on the patents, that Martin's ideas are unpatentable, and that the company is protected by something called the "doctrine of prosecution history estoppel." So there!

We're not patent lawyers, but Martin's patent doesn't seem to offer much improvement over the 1993 touchscreen patents he himself references. Still, he'll have his day in court, and we'll be sure to let you know what happens once that day is done.

This article was originally published on Joystiq.

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