Continuous injection of an inert gas through a drill rig for drilling into potentially hazardous areas Page: 1 of 8
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EXPRESS MAIL LABEL NO.
FD: 1-3 -q
CONTINUOUS INJECTION OF AN INERT GAS THROUGH A DRILL RIG
FOR DRILLING INTO POTENTIALLY HAZARDOUS AREAS
Steve H. McCormick
William R. Pigott
This report was prepared as an account of work sponsored by an agency of the United States
Government. Neither the United States Government nor any agency thereof, nor any of their
employees, makes any warranty, express or implied, or assumes any legal liability or responsi-
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United States Government or any agency thereof.
PROCESSED FROM BEST AVAILASKE COPY
ISTRIBUTION OF THIS DOCUMENT IS UNLMITED
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McCormick, S.H. & Pigott, W.R. Continuous injection of an inert gas through a drill rig for drilling into potentially hazardous areas, patent, April 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc699198/m1/1/: accessed January 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.