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
Semiconductor device with hetero-junction bodies
Bread basket
Display screen of a mobile terminal or portion thereof with a graphical user interface
Organic light emitting diode display device and method of fabricating the same
Radiation-curable ink composition, ink jet recording method, and recorded matter
XDSL system and signal transmission method, sending device, and receiving device of xDSL system
Financial transaction cards
  Randomly Featured Patents
Audio speaker mounts for off-road vehicles
Adaptive cross-polarization interference cancellation arrangements
Manufacturing printed wiring boards having electromagnetic wave shielding
Wireless communication method, base station, and receiving terminal
Method for managing radio resources in an utran radio access network
Washing machine
Method for preparing tinted contact lens
Apparatus for selective distribution of messages over a communications network
Semiconductor structure having multiple thicknesses of high-K gate dielectrics and process of manufacture therefor
System and method for activation of an enhanced telecommunication service