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| Number | Title | Issue Date |
| 6619423 | Measuring device for measuring the elastic properties of a surface structure A measuring device for measuring the elastic properties of a surface structure (3), comprising a probe (2) arranged within a housing (1), a transmitter and at least one receiver, the transmitter transmitting acoustic pulses and the receiver picking up the... | 09/16/2003 |
| 4775028 | Method and system for depth sounding A method and apparatus for the sounding of waters, particularly suitable for depth (and the like) sounding of Arctic waters, comprises shooting an energetic projectile at the water or ice surface from, say, a helicopter which has suspended close to the wa... | 10/04/1988 |
| 4126203 | Air-coupled seismic detector A method and apparatus for improved detection of reflected seismic energy through detection of air pressure variations in air above an air/earth surface interface. One form of apparatus suitable for detection in air of seismic energy waves emanating from ... | 11/21/1978 |
| 4016951 | Air transportable seismic exploration system for use on ice-covered waters A seismic exploration system for use on ice-covered waters is disclosed. The system comprises a housing which contains equipment such as an engine, a compressor, means for boring holes in the ice, and acoustic signal generating means that can be lowered i... | 04/12/1977 |