1118 EXPLORATION GEOPHYSICS 



2,288,884 Issued July 7, 1942. M. C. Bowsky. "Electrical Logging in Oil-Filled 



Wells." 

 2,288,973 Issued July 7, 1942. J. Neufeld and E. H. Cooley. "Well Surveying Method 



and Apparatus." 

 2,289,687 Issued July 14, 1942. R. W. Stuart. "Method and Apparatus for Logging 



Wells." 

 2,290,075 Issued July 14, 1942. M. Schlumberger. "Thermal Process and Device for 



Surveying the Beds Traversed by Drill Holes." 

 2,290,408 Issued July 21, 1942. W. J. Crites. "Exploration of Boreholes." 

 2,291,692 Issued Aug. 4, 1942. R. T. Qoud. "Magnetic Logging." 

 2,297,568 Issued Sept. 29, 1942. E. G. Leonardon. "Spontaneous Potential by Induc- 

 tion." 

 2,297,754 Issued Oct. 6, 1942. G. H. Ennis. "Method of Locating Strata in Wells and 



Electrode Apparatus Therefor." 

 2,301,326 Issued Nov. 10, 1942. C. E. Reistle, Jr. "Process for Obtaining Tempera- 

 ture Gradients in Bore Holes." 

 2,307,887 Issued Jan. 12, 1943. C. J. Haynes. "Rotating Contact Device." 

 2,310,611 Issued Feb. 9, 1943. E. E. Blondeau. "Electrical Exploration of Geologic 



Strata." 

 2,311,757 Issued Feb. 23, 1943. J. J. Jakosky. "Thermometric Method and Apparatus 



for Exploration of Boreholes." 

 2.313,384 Issued March 9, 1943. R. E. Lee. "Means for Determining the Tectonics 



and Nature of Subsurface Geology." 

 2,315,127 Issued March 30, 1943. W. D. Mounce. "Resistance Thermometer." 

 2,315,840 Issued April 6, 1943. W. J. Crites. "Borehole Thermometer." 

 2,316,942 Issued April 20, 1943. H. G. Doll. "Apparatus for Measuring Temperatures 



in Boreholes." 

 2,317,259 Issued April 20, 1943. H. G. Doll. "Device for Determining the Strata 



Traversed by Drill Holes." 

 2,317,304 Issued April 20, 1943. C. Schlumberger. "Apparatus for the Electrical Sur- 

 veying of Boreholes." 

 2,324,103 Issued July 13, 1943. L. C. Miller. "Well Survey Apparatus." 

 2,333,883 Issued Nov. 9, 1943. R. G. Piety. "Well Surveying Device." 

 2,334,491 Issued Nov. 16, 1943. J. J. Jakosky. "Method and Apparatus for Determin- 

 ing the Electrical Characteristics of Geological Formations Traversed by 

 Drill Holes." 

 2,337,442 Issued Dec. 21, 1943. L. W. Blau. "Well Logging." 

 2,340,987 Issued Feb. 8, 1944. F. T. Robidoux. "Electrical Well Caliper." 

 2,364,159 Issued Dec. 5, 1944. G. Muffly. "Apparatus for Electrical Bore Logging." 

 2,364,957 Issued Dec. 12, 1944. N. Douglas. "Electrical Surveying." 

 2,366,694 Issued Jan. 9, 1945. J. C. Bender. "Means and Method of Well Logging." 

 2,370,814 Issued March 6, 1945. J. A. Riise, Jr. "Method of Well Logging." 

 2,371,270 Issued March 13, 1945. A. L. Smith. "Electrical Logging of Well Bores." 

 2,376,168 Issued May 15, 1945. W. D. Mounce. "Well Logging." 

 2,388,141 Issued Oct. 30, 1945. G. G. Harrington. "Electrical Logging Apparatus." 

 2,388,896 Issued Nov. 13, 1945. C. B. Aiken. "Electrical Alethod and Apparatus for 



Logging Boreholes." 

 2,393,009 Issued Jan. 15, 1946. M. E. Chun. "Electrical Well Logging Method and 

 Apparatus." 



2.397.254 Issued March 26, 1946. G. H. Ennis. "Method and Apparatus for Electrical 

 Coring in Cased Boreholes." 



2.397.255 Issued March 26, 1946. G. H. Ennis. "Method of and Apparatus for Elec- 

 trically Determining the Formation in Wells." 



2,398,324 Issued April 9, 1946. B. Pontecorvo. "Well Surveying." 

 2,398,562 Issued April 16, 1946. W. L. Russell. "Apparatus for Well Logging." 

 2,398,761 Issued April 23, 1946. C. B. Aiken. "Method and Apparatus for Simulta- 

 neous Determination of Various Properties of the Subsoil." 

 2,398,868 Issued April 23, 1946. R. W. Stuart and D. Silverman. "Apparatus for 



Electrical Well Logging." 

 2,400,593 Issued May 21, 1946. J. Neufeld. "Method of and Apparatus for Investi- 

 gation of Cased Drill Holes." 

 2,400,678 Issued May 21, 1946. G. E. Archie. "Method and Apparatus for Electri- 

 cally Logging Wells." 



