[printer]

Would you ever think about patenting a double touch interaction when you were the first to implement a double click action on a touchscreen? I think these things are so obvious I would even be ashamed to call them my innovation.

[wangweij]

If you think it's obvious, Have you ever tried to double click the screen or pinch an image on your old Palm Pilot hoping the size would change?

[printer]

Well the Palm Pilot isn't multitouch so ofcourse you can't do a pinch there. But double click just works out of the box on almost all devices when an existing OS is used.

I think you should give this a read: http://www.billbuxton.com/multitouchOverview.html and notice these words: "What I am pointing out, however, is that "new" technologies - like multi-touch - do not grow out of a vacuum."