Portable device using location determination and MEMS...

Horology: time measuring systems or devices – Plural time zones

Reexamination Certificate

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Details

C368S011000, C368S047000, C368S155000

Reexamination Certificate

active

07852711

ABSTRACT:
Devices and methods for determining a current location using a location detection element, determining a local time zone based on the current location using a memory unit, keeping time using a micro-electro-mechanical-system (MEMS) oscillator unit co-fabricated on a common substrate with the location detection element, and determining a local time based on the local time zone using a controller element. Optional embodiments comprise a MEMS oscillator unit that is fabricated underneath, next to, or on top of the location detection element. Additional embodiments comprise a GPS chip optionally assisted by a cell phone chipset or FM receiver to enhance location and time determination. Optional embodiments may additionally enter a power conservation mode after the current location has been determined, or may detect air travel to disable the location detection element and enable the location detection element upon detected landing.

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patent: 5724316 (1998-03-01), Brunts
patent: 6278660 (2001-08-01), Tognazzini
patent: 7391273 (2008-06-01), Seki et al.
patent: 2009/0196124 (2009-08-01), Mooring

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