BORE-HOLE INVESTIGATIONS 1121 



2,370,162 Issued Feb. 27, 1945. D. G. C. Hare. "Method and Apparatus for Logging 

 Boreholes." 



2,371,628 Issued March 20, 1945. S. Krasnow. "Method and Apparatus for Dynamic 

 Measurement of Borehole Radioactivity." 



2,374,197 Issued April 24, 1945. D. G. C. Hare. "Borehole Logging Method and 

 Apparatus." 



2,376,196 Issued May 15, 1945. S. A. Scherbatskoy. "Ionization Chamber." 



2,376,821 Issued May 22, 1945. _ S. A. Scherbatskoy, R. E. Fearon, J. Neufeld, and 

 G. Swift. "Well Logging Instrument." 



2,378,408 Issued June 19, 1945. G. Herzog. "Method and Apparatus for Logging 

 Boreholes." 



2,381,904 Issued Aug. 14, 1945. D. G. C. Hare. "Method and Apparatus for Logging 

 Wells." 



2,382,279 Issued Aug. 14, 1945. A. Wolf and G. Herzog. "Device for Recovering a 

 Radiation Source." 



2,384,840 Issued Sept. 18, 1945. S. Krasnow and L. F. Curtiss. "Radioactivity Well 

 Logging Method and Apparatus." 



2,385,378 Issued Sept. 25, 1945. R. G. Piety. "Well Surveying." 



2,385,857 Issued Oct. 2, 1945. G. Herzog. "Cushioning Device for Radiation De- 

 tectors." 



2,390,931 IssuedDec.il, 1945. R. E. Fearon. "Well Logging Method." 



2,390,965 Issued Dec. 11, 1945. S. A. Scherbatskoy. "Central Electrode Support." 



2,409,436 Issued Oct. 15, 1946. S. Krasnow and L. F. Curtiss. "Method and Appa- 

 ratus for Direct Recording of Borehole Radioactivity." 



2,416,702 Issued March 4, 1947. S. Krasnow. "Apparatus and Method for Recording 

 Borehole Radioactivity." 



2,429,577 Issued Oct. 21, 1947. R. W. French. "Method for Determining Fluid Con- 

 ductance of Earth Layers." 



2,433,554 Issued Dec. 30, 1947. G. Herzog. "Well Logging Apparatus." 



2,436,503 Issued Feb. 24, 1948. J. Y. Cleveland. "Delayed Well Logging." 



2,443,680 Issued June 22, 1948. G. Herzog. "Method of Determining the Nature of 

 Substrata." 



2,443,731 Issued June 22, 1948. G. Herzog and K. C. Crumrine. "Method and Appa- 

 ratus for Logging Boreholes." 



2,446,588 Issued Aug. 10, 1948. G. Herzog and A. Wolf. "Method of Determining 

 the Permeability of Substrata." 



2,450,265 Issued Sept. 28, 1948. A. Wolf. "Method of Logging Boreholes." 



