Patent suit challenges motion-based input with Apple's iPhone 4

A new lawsuit takes aim at the accelerometer- and gyroscope-powered abilities of Apple's iPhone 4, alleging that the interactive, three-dimensional input methods are in violation of a U.S. patent. The lawsuit, filed this week by Triton Tech of Texas, names both Apple and Nintendo as defendants. Triton is the owner of U.S. Patent No. 5,181,181, entitled "Computer Apparatus Input Device for Three-Dimensional Information."

That patent describes a handheld device that includes multiple accelerometers and angular rate sensors for detecting positioning and motion. By interpreting acceleration, velocity and relative position of the device, it can allow users to interact with a computer or other device with six degrees of motion in a three-dimensional space.

Triton's lawsuit only specifically singles out the iPhone 4 from Apple as an infringing device, though it implies that other devices could be in violation. Apple's iPod touch and iPad also include accelerometers that are used for input.