1114 EXPLORATION GEOPHYSICS 



1.555.801 Issued Sept. 29, 1925. Frederick W. Ruber. "Method of Locating Water- 

 Bearing Strata in Bore Holes." 



1.555.802 Issued Sept. 29, 1925. Frederick W. Huber. "Apparatus for Locating 

 Water-Bearing Strata in Bore Holes of Flowing Wells." 



1.555.803 Issued Sept. 29, 1925. Frederick W. Huber. "Electrode Means for Con- 

 ductivity Tests of Liquids in Oil Wells or other Bodies of Liquid." 



1,582,184 Issued April 27, 1926. Sidney W. Mims. "Method and Means for Per- 

 forating Well Casings." 



1,593,150 Issued July 20, 1926. F. L. Von Wurstemberger. "Apparatus for Deter- 

 mining Deflections from the Perpendicular of Bore Holes." 



1,700,642 Issued Jan. 29, 1929. W. Meindersma. "Apparatus for Indicating and 

 Determining the Point of Entrance of Fluids in Bore Holes." 



1,720,325 Issued July 9, 1929. John D. Hackstaff and Labanna T. McCutcheon. 

 "Method and Apparatus for Determining the Position of Fluid-Bearing 

 Sands while Drilling Wells." 



1,725,979 Issued Aug. 27, 1929. George H. Ennis. "Dose Distributor." 



1,786,196 Issued Dec. 23, 1930. George H. Ennis. "Method and Apparatus for De- 

 termining the Location of Water Strata in Wells." 



1,793,894 Issued Feb. 24, 1931. Reuben C. Baker. "Formation Direction Indicator." 



1,796,547 Issued Mar. 17, 1931. Laurence E. Trout. "Apparatus for Indicating 

 the Flow of Subsurface Fluids." 



1,811,648 Issued June 23, 1931. E. E. Rosaire. "Method of Determining the Straight- 

 ness of Drill Holes in the Earth." 



1,819,923 Issued Aug. 18, 1931. Conrad Schlumberger. "Electrical Process and Ap- 

 paratus for the Determination of the Nature of the Geological Formations 

 Traversed by Drill Holes." 



1,822,203 Issued Sept. 8, 1931. Frank M. Collins. "Indicating Means for Wells." 



1,826,961 Issued Oct. 13, 1931. Louis B. Slichter. "Apparatus for Exploring for 

 Ore." 



1,845,379 Issued Feb. 16, 1932. Thomas S. West. "Process of and Apparatus for 

 Locating Mineral Deposits in Subsurface Earth Strata." 



1,865,847 Issued July 5, 1932. George H. Ennis. "Method of Locating the Point of 

 Entry of Water into Oil Wells." 



1,877,593 Issued Sept. 13, 1932. Irwin Roman. "Method and Apparatus for Sur- 

 veying Bore Holes." 



1,889,889 Issued Dec. 6, 1932. George H. Ennis. "Method of Testing Open Wells." 



1,891,628 Issued Dec. 20, 1932. Charles R. Nichols. "Method of Determining Angle 

 and Direction of Dip of Geological Formations." 



1,894,328 Issued Jan. 17, 1933. Conrad Schlumberger. "Electrical Device for the 

 Determination of Specific Resistivity." 



1,913,293 Issued June 6, 1933. Conrad Schlumberger. "Electrical Process for the 

 Geological Investigation of the Porous Strata Traversed by Drill Holes." 



1,913,845 Issued June 13, 1933. Hallan N. March and John H. Howard. "Apparatus 

 for Determining Deep-Well Temperatures." 



1,927,664 Issued Sept. 19, 1933. John C. Karcher. "Alethod and Apparatus for Ex- 

 ploring Bore Holes." 



1,970,342 Issued Aug. 14, 1934. Conrad Schlumberger. "Process for the Reconnais- 

 sance of the Geological Formations, and Especially for the Study of Porous 

 Strata Encountered by a Bore Hole." 



1.994.761 Issued Mar. 19, 1935. George H. Ennis. "Solution for Use in Testing 

 Wells." 



1.994.762 Issued Mar. 19, 1935. George H. Ennis. "Electrolyte for Use m Testmg 

 Wells." 



1,995,492 Issued Mar. 26, 1935. O. E. Andrus and K. S. Willburg. "Device for 

 Determining the Composition of Fluid Bodies in Motion and for Selec- 

 tively Distributing the Flow of Portions of said Bodies to Predetermined 

 Locations." 



1,996,530 Issued April 2, 1935. Karl Sundberg and Erik Helmer Lars Hedstrom. 

 "Method of and Apparatus for Electrical Investigation of Rock Drill 

 Holes." 



2,015,873 Issued Oct. 1, 1935. Conrad Schlumberger. "Apparatus for Samphng 

 the Rock in Bore Holes." 



