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
Wall flow type exhaust gas purification filter
Vehicle battery with cell balancing current paths and method of charging the same
Determining ill conditioning in square linear system of equations
Preferential selection of candidates for delta compression
Recording apparatus, recording method, reproducing apparatus, reproducing method, program, and recording/producing apparatus
Methods and systems for temporarily sharing position data between mobile-device users
Cationic polymers for antimicrobial applications and delivery of bioactive materials
  Randomly Featured Patents
Secure and dynamic biometrics-based token generation for access control and authentication
Constant voltage power supply
Speckle noise reduction based on longitudinal shift of sample
Method of using beam homogenizer and laser irradiation apparatus
Meltblown nonwoven webs including nanofibers and apparatus and method for forming such meltblown nonwoven webs
Cigarette filter rod and method of making same
Combined ground ripper tooth and hydraulic reset assembly
Chirped pulse fiber amplifier
Method of continuously producing a cyclododecanone compound