Stop the insanity!
I'd never thought that I would invoke Susan Powter's catch-phrase, but Jesus, a patent on double-clicking?!!
Actually, it's worse than that. It's a 'shield-based' patent covering a "time-based hardware button for application launch".
I think my 5 year old Motorola mobile phone interface has this feature.
Hell, the Texas Instruments Speak 'n Spell I played with at 4 years old had that!