METHOD OF DETERMINING RESISTIVITY OF AN EARTH FORMATION WITH PHASE RESISTIVITY EVALUATION BASED ON A PHASE SHIFT MEASUREMENT AND ATTENUATION RESISTIVITY EVALUATION BASED ON AN ATTENUATION MEASUREMENT AND THE PHASE SHIFT MEASUREMENT

Granted: Oct 7, 2003 Filed: Jun 8, 2001

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.