Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Reexamination Certificate
2011-04-12
2011-04-12
Fulton, Christopher W (Department: 2841)
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
Reexamination Certificate
active
07921572
ABSTRACT:
Multiple instances of a geomagnetic field are calculated. Multiple instances of an average magnitude of a subset of the instances of the geomagnetic field are also calculated. When the average magnitude changes by more than a first predetermined threshold, the user is informed that compass accuracy has degraded. Other embodiments are also described and claimed.
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Huang Ronald K.
Mayor Robert
Patel Parin
Piemonte Patrick S.
Apple Inc.
Blakely , Sokoloff, Taylor & Zafman LLP
Fulton Christopher W
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