SEISMIC METHODS 931 



1,669,135 Issued May 8, 1928. Karl Ludwig Kithil. "Seismo-Vibrometer." 

 1,672,495 Issued June 5, 1928. Burton McCollum. "Method and Apparatus for De- 

 termining the Contour of Subterranean Strata." 

 1,672,892 Issued June 12, 1928. Karl Ludwig Kithil. "Seismo-Vibrator." 

 1,706,066 Issued Mar. 19, 1929. J. C. Karcher. "Method and Apparatus for Locating 



Geological Formations." 

 1,743,358 Issued Jan. 14, 1930. J. G. Koenigsberger. "Method of Locating Salt or 



Rock Layers." 

 1,774,379 Issued Aug. 26, 1930. J. H. Jones. "Seismograph and Applicable to Other 



Measuring Instruments." 

 1,782,445 Issued Nov. 1930. Frank Rieber. "System and Method for Geophysical 



Exploration." 

 1,784,415 Issued Dec. 9, 1930. Hugo Benioflf. "Electrical Recording Seismograph." 

 1,784,439 Issued Dec. 9, 1930. Harvey C. Hayes. "Method for Making Subter- 

 ranean Surveys." 

 1,790,080 Issued Jan. 27, 1931. A. N. Stanton. "Method of Seismological Research." 

 1,814,444 Issued July 14, 1931. Harvey C. Hayes. "Geophysical Method and 



Apparatus." 

 1,825,554 Issued Sept. 29, 1931. Guy A. Rupp & Walter O. Snelling. "Seismometer." 

 1,827,371 Issued Oct. 13, 1931. Frank Rieber. "Method & Means for Geological 



Explorations." 

 1,832,901 Issued Nov. 24, 1931. H. C. Harrison. "Measurement of Mechanical 



Impedance." 

 1,842,968 Issued Jan. 26, 1932. Sepp Horvath. "Seismograph." 

 1,843,725 Issued Feb. 2, 1932. John C. Karcher. "Determination of Subsurface 



Formations." 

 1,848,490 Issued Mar. 8, 1932. A. M. Nicolson. "Stress Measuring." 

 1,864,214 Issued June 21, 1932. O. Scott Petty. "Instrument for Detecting 



Vibrations." 

 1,869,828 Issued Aug. 2, 1932. James E. Shrader. "Device for Measuring and Re- 

 cording Vibrations in Three Directions Simultaneously." 

 1,872,504 Issued Aug. 16, 1932. Cullen R. Rogers. "Electrical Geological Disturb- 



3.ncG Detector " 

 1,878,029 Issued Sept. 20, 1932. Orley H. Truman. "Underground Exploration 



Method." 

 1,880,425 Issued Oct. 4, 1932. Paul B. Flanders. "Measurement of Mechanical 



Impedance." 

 1,899,970 Issued Mar. 7, 1933. Burton McCollum. "Seismic Method of Profiling 



Geologic Formations." 

 1,909,205 Issued May 16, 1933. Burton McCollum. "Seismic Method of Profiling 



Geologic Formations." 

 1,919,917 Issued July 25, 1933. Orley H. Truman. "Geophysical Exploration Method." 

 1,923,088 Issued Aug. 22, 1933. Harvey C. Hayes. "Vibration Detector." 

 1,936,321 Issued Nov. 21, 1933. Richard Ambronn. "Process of and Device for 



Detecting and Measuring Minimum Accelerations." 

 1,943,725 Issued Jan. 16, 1934. Oscar E. Dudley and Con Lucid. "Method of Creating 



Artificial Seismic Waves." 

 1,959,004 Issued May 15, 1934. John E. Owen. "Method for Surveying Subsurface 



Formations." 

 1,978,668 Issued Oct. 30, 1934. Kenneth E. Burg. "Method of Determining Geo- 

 logical Structure." 

 1,983,483 Issued Dec. 4, 1934. Franz J. G. Neumann and Werner R. Haubold. 



"Apparatus for Making Geophysical Measurements." 

 1,998,412 Issued April 15, 1935. Harold R. Prescott. "Method of Making Geological 



Explorations." 

 2,003,780 Issued June 4, 1935. William T. Born. "Seismic Surveying." 

 2,008,857 Issued July 23, 1935. Paul B. Flanders. "Mechanical Impedance Meter." 

 2,018,737 Issued Oct. 29, 1935. John E. Owen. "Seismic Surveying." 

 2,018,756 Issued Oct. 29, 1935. Ludwig W. Blau, Morris M. Slotnick & Louis 



Statham. "Compound Seismograph." 

 2,021,943 Issued Nov. 26, 1935. Burton McCollum. "Seismic Method for Profiling 



Geologic Formations." 



