Communications – electrical: acoustic wave systems and devices – Transmitter systems
Reexamination Certificate
2008-04-11
2010-11-30
Lobo, Ian J (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Transmitter systems
Reexamination Certificate
active
07843768
ABSTRACT:
The disclosed system uses seismic signaling to locate survivors in a mine collapse. A separate transmitter with a specific pre-selected frequency or frequencies is placed in pre-positioned safety zones of a mine. The system generates frequency-locked, unmodulated seismic energy, which allows rescuers to identify the safety zone where a transmitter is activated. The transmitter comprises an oscillator that generates the signal. The oscillator drives the transducer. The transducer causes the inertial mass to move. The movement of the inertial mass generates the seismic waves, which are conducted through the pressure plate to the earth. The seismic signal is detected then amplified, filtered, converted and then processed. The use of a continuous signal enables the processing unit to identify the frequency of the signal with a very low error rate, using frequency content identification. The disclosure also describes a method for transmitting seismic waves through the earth using the above described system.
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Discovery Channel Canada featured on May 23, 2007, posted at http://academics.vmi.edu/ee—js/Research/ELFSD/ELFSD.htm, Discovery Channel link.
WSLS TV Channel 10 out of Roanoke, VA featured no earlier then May 15, 2007, posted at http://academics.vmi.edu/ee—js/Research/ELFSD/ELFSD.htm, WSLS link.
Flathers, III George W
Squire James C.
Sullivan Gerald A
Fitch Daniel L.
Lobo Ian J
Wharton Aldhizer & Weaver, PLC
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