"Examples of... applications may be low battery indication, received message, received call, calendar alert, change of profile, eg based on timing, change of time zone, or any other," the filing reads。

"The magnetic field may cause vibration of one short pulse, multiple short pulses, few long pulses... strong pulses, weak pulses and so on."

The filing also suggests that the magnetised marking could be used as an identity check. It says that by picking a certain shape the user could create a "specific magnetic impedance" - effectively their own magnetic fingerprint。

It says this could act as a "password" and gives the example of a laptop refusing to display content on its screen unless it verifies its user is close by。

'Invasive procedure'

Nokia is far from the only technology firm investigating new uses for haptic - or touch - feedback。

HTC and Samsung have released mobile phones that slightly vibrate when the user types or presses graphical-representations of buttons on their screens。

Engineers at the University of Utah are developing a video games controller that uses haptic feedback via the user's thumbs to create the sensations of waves, pulses and a bounce effect。

Researchers at the University of Leeds have also created a handheld prototype designed to let cancer specialists locate and categorise patients' tumours by how dense they feel while examining them from a remote location。

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