theodp writes: GeekWire reports that a Microsoft researcher's 1991 video could torpedo Apple’s key "slide to unlock" patent, one of 5 patents that the iPhone maker cited in its demand for $40 per Samsung phone. Confronted with what appears to be damning video evidence of prior art that pre-dates its "invention" by more than a decade, Apple has reportedly arguied that the sliding on/off switch demoed by Catherine Plaisant is materially different than the slide to unlock switch that its 7 inventors came up with. Apple's patent has already been deemed invalid in Europe because of similar functionality present in the Swedish Neonode N1M.
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