[WindowsCentral.com]

Hot on the heels of last week's touch-sensitive Surface Pen clip patent, Microsoft seems to be exploring physical feedback functions too.
Last week a patent emerged which appears to describe a touch-sensitive clip for the Surface Pen, allowing users to interact with Windows in new ways via the pen alone. Today, we found another patent which relates to the Surface Pen, which appears to be a method for creating haptic, physical feedback to the pen user via small magnets within the stylus' tip.

Full story from the WindowsCentral blog...