Resources Contact Us Home
External air release control in seismic air gun

Image Number 2 for United States Patent #4219097.

Disclosed is a seismic source device, known in the industry as an air gun, having shuttle and external sliding valve control for allowing a predetermined discharge of compressed air into water for purposes of seismic exploration. The shuttle is controlled by air pressure to move it upward, thereby permitting compressed air in the firing chamber to exhaust through exhaust ports. The external sliding valve had been held in a downward position by air pressure supplied from the firing chamber, compressing a spring. As the firing chamber pressure drops, the compressed spring expands, forcing the sliding valve to move upward, closing the exhaust ports. By preventing further discharge of air, secondary pulses are greatly reduced, with little or no loss in acoustic output, thereby enhancing the operation of the entire system. Further, by preventing all the air in the firing chamber from being discharged, the system becomes more efficient and more cost effective.

  Recently Added Patents
Restarting event and alert analysis after a shutdown in a distributed processing system
Calibration method for non-ideal transceivers
Memory cell and memory cell array using the same
Semiconductor device
Permanent magnet rotor with flux concentrating pole pieces
Printing system, information processing apparatus, print job processing method, information processing method, program, and storage medium
  Randomly Featured Patents
Method for evaluating anti-contamination level on a surface of optical recording medium, the apparatus and the optical recording medium
Periplasmic protease mutants of Escherichia coli
Integrated circuit with multi-length output transistor segments
Combined light fixture and lens
Grid array packaged integrated circuit
Image forming method and apparatus for setting an image forming parameter based on a printing medium
Display screen portion with icon
Reset of a selected I/O channel and associated peripheral equipment by means independent of the channel
Process for removal of potassium values from pulp mill liquors
Interlocking contactor assembly