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
Apparatus and method for tire temperature measurement
High voltage metal oxide semiconductor device having a multi-segment isolation structure
System and method for updating presence information in instant messaging applications on a mobile device
Fluid container
Dual-phone cellphone case
Photovoltaic system
System and method for accurate time sampling in presence of output delay
  Randomly Featured Patents
Packet transmission method, packet transmission device, radio frame transmission method, mobile communication method, mobile communication system, and exchange
Pathlength-independent methods for optically determining material composition
Dust inhibiting vacuum hood
Audio speaker and method for assembling an audio speaker
Using separate recording channels for speech-to-speech translation systems
High TC superconducting cable conductor employing oxide superconductor
Prevention of deleterious deposits in a coal liquefaction system
Suspension liquid separator
Method and system for aggregating data distribution models
Calcium independent cytosolic phospholipase A.sub.2 /B enzymes