Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2009-05-08
2010-06-01
Patidar, Jay M (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
C175S045000
Reexamination Certificate
active
07728595
ABSTRACT:
In a system in which a transmitter is moved through the ground in a region, the system including a locator for tracking the position of and/or guiding the transmitter as the transmitter moves through the ground, a locating signal is transmitted from the transmitter that is selectively operable at a current one of at least two frequencies for use in tracking the transmitter by receiving the locating signal at the frequency using the locator. A selected one of the frequencies of the locating signal is indicated to the locator using a frequency code that is produced by a locating signal frequency control arrangement which forms part of the transmitter, which frequency code can individually identify each of the frequencies. An associated transmitter is also described.
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Brune Guenter W.
Mercer John E.
Merlin Technology Inc.
Patidar Jay M
Pritzkau Patent Group LLC
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