Horology: time measuring systems or devices – Electrical time base – Solid state oscillating circuit type
Reexamination Certificate
2006-05-16
2006-05-16
Hirshfeld, Andrew H. (Department: 2854)
Horology: time measuring systems or devices
Electrical time base
Solid state oscillating circuit type
C310S348000
Reexamination Certificate
active
07046584
ABSTRACT:
A compensated ensemble crystal oscillator clock system for use in a well borehohe system. The clock system includes preferably four quad compensated clocks, a compensated temperature sensor, and software for processing and correcting system response. Physical fabrication of elements of the quad compensated clocks, the compensated temperature sensor and cooperating software minimized drift in frequency of the oscillator clock system in harsh borehole environments encountered while drilling a borehole. The clock system exhibits a frequency stability of 2.8×10−9or less over a temperature range of from 0° C. to 185° C. The compensated ensemble crystal oscillator clock system is particularly applicable to seismic-while-drilling operations wherein precise downhole measurements of time are required typically over a period of days.
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Minto James
Sorrells Martin
Hinze Leo T.
Hirshfeld Andrew H.
McCollum Patrick H.
Precision Drilling Technology Services Group Inc.
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