From Phone Arena:
Nokia has filed for a patent that offers a new and interesting take on mobile notifications. The patent, dated March 15, 2012, is for a ferromagnetic ink tattoo that is able to vibrate based on signals sent from a phone.
Nokia first describes a material that can attach to the surface of the skin, not to dissimilar to a sticker or a “patch”. The material would be able to be paired to a phone and emit various vibration patterns. In essence, a user could give a contact a specific pattern, which would enable them to be able to know who is calling without looking at the device, much like a custom ringtone.
Taking things to a new level of dedication, Nokia also describes the same technology being deployed in an actual tattoo. The process would involve demagnetizing the ink before administering the tattoo. Once it is in the skin, the ink would need to be magnetized by an external magnet. This technique would allow for enhanced sensitivity.
Just the tech I was thinking my latest ink needed too.
via Ales Kot