While Apple’s slide-to-unlock patent features sliding horizontally across the screen along a predefined path, Nokia’s version involves sliding an icon across a screen until it reveals a hidden app, which will launch once the icon that’s being dragged fully covers it. We’re guessing this can be used to launch predefined apps, like messages, emails, the browser, the camera, phone dialer, etc.
Oddly enough none of Nokia’s phones uses this patent at the moment, although given the nature of patents, it’s hard to tell if and when they might be made a reality. However it should be noted that this particular patent was applied for back in 2007, so there might be a good chance that this patent has since been discarded.