BORE-HOLE INVESTIGATIONS 1115 



2,018,080 Issued Oct. 22, 1935. Oscar Martienssen. "Method of and Device for 

 Differentiating Between Geologic Strata Traversed by Bore Holes." 



2,029,491 Issued Feb. 4, 1936. Wilfred G. Lane. "Gun Type Formation Tester." 



2,029,454 Issued Feb. 4, 1936. Walter T. Wells. "Means and Method of Perforating 

 Well Casings." 



2,029,478 Issued Feb. 4, 1936. Marcus W. Haines. "Means and Method of Per- 

 forating Deep Wells." 



2,029,490 Issued Feb. 4, 1936. Wilfred G. Lane. "Method and Means for Controlling 

 Deep Well Gunfire for Perforating Casings." 



2,033,562 Issued Mar. 10, 1936. Walter T. Wells. "Method for Preparing Oil Wells 

 for Production." 



2,037,306 Issued April 14, 1936. Ludwig W. Blau and Ralph W. Gemmer. "Method 

 and Apparatus for Logging a Well." 



2,038,046 Issued April 21, 1936. J. J. Jakosky. "Method and Apparatus for Alter- 

 nating Current Investigation of Uncased Drill Holes." 



2,050,128 Issued Aug. 4, 1936. Conrad Schlumberger. "Thermometric Method of 

 Locating the Top of the Cement Behind a Well Casing." 



2,053,967 Issued Sept. 8, 1936. E. N. Merrill and George A. Young. "Apparatus 

 for Determining Well Temperatures." 



2,070,912 Issued Feb. 16, 1937. Eugene McDermott. "Method of Electrically Ex- 

 ploring Bore Holes." 



2,072,950 Issued Mar. 9, 1937. F. W. Huber. "Method of and Apparatus for 

 Electrically Exploring Earth Formations." 



2,076,211 Issued April 6, 1937. A. P. & G. H. Straatman. "Apparatus for Well 

 Surveying." 



2,084,143 Issued June 15, 1937. J. N. Hummel. "Process for Inspecting the Ground." 



2,085,664 Issued June 29, 1937. John C. Karcher. "Method and Apparatus for De- 

 termining Porosity of Rock Formations." 



2,089,216 Issued Aug. 10, 1937. Edward D. Lynton. "Apparatus for Orienting 

 Cores." 



2,096,359 Issued Oct. 19, 1937. D. G. Hawthorne. "Apparatus for Subsurface 

 Surveying." 



2,104,743 Issued Jan. 11, 1938. Henry N. Herrick. "Method of Correlating Subsurface 

 Strata." 



2,105,650 Issued Jan. 18, 1938. Donald Hering. "Core Orientation Apparatus." 



2,114,056 Issued April 12, 1938. Ralph W. Lohman. "Method for Electrically In- 

 vestigating Subterranean Strata." 



2,131,993 Issued Oct. 4, 1938. Bruno A. Wittkuhns and Frederic M. Watkins. "Sonic 

 Depth and Height Indicator." 



2,132,807 Issued Oct. 11, 1938. W. M. Rust, Jr., et al. "Single Cable Electrical Well 

 Logging." 



2,133,786 Issued Oct. 18, 1938. J. Neufeld. "Method of and Apparatus for Deter- 

 mining the Dip of the Earth's Substrata." 



2,140,798 Issued Dec. 20, 1938. J. J. Jakosky. "Electrical Method and Apparatus 

 for Determining the Characteristics of Geologic Formations." 



2,141,826 Issued Dec. 27, 1938. C. Schlumberger. "Method and Arrangement for 

 the Electrical Survey of the Strata Traversed by a Bore Hole." 



2,142,555 Issued Jan. 3, 1939. M. C. Bowsky and A. D. Winter. "Automatic Com- 

 pensator for Geophysical Devices." 



2,147,942 Issued Feb. 21, 1939. Randall Wright. "Method for Determining Direc- 

 tional Orientation of Materials." 



2,150,169 Issued Mar. 14, 1939. J. J. Jakosky. "Method and Apparatus for Con- 

 tinuous Exploration of Bore Holes." 



2,153,802 Issued Apr. 11, 1939. J. J. Jakosky. "Method and Apparatus for Con- 

 tinuous Exploration of Bore Holes." 



2,155,133 Issued Apr. 18, 1939. J. J. Jakosky. "Electrical Method and Apparatus 

 for Determining the Characteristics of Geologic Formations." 



2,156,052 Issued April 25, 1939. C. W. Cooper. "Logging Device." 



2,156,519 Issued May 2, 1939. C. P. Walker. "Means for Measuring the Location 

 of Obstructions in Wells." 



2,159,418 Issued May 23, 1939. E. Babcock. "Electrical Logging Apparatus." 



2,161,976 Issued June 13, 1939. F. T. Robidoux. "Electrode for Well Logging." 



