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
Metal-containing compositions and method of making same
Methods of synthesizing heteromultimeric polypeptides in yeast using a haploid mating strategy
Restore software with aggregated view of content databases
Expressive grouping for language integrated queries
Method for incubating the contents of a receptacle
Control device for radiation imaging apparatus and control method therefor
Implantable medical devices including elongated conductor bodies that facilitate device and lead configuration variants
  Randomly Featured Patents
Process for producing pitch useful as raw material for carbon fibers
Dial information storing and redialing method for use in a telephone
Beverage mug
Bag with corners
Wheel structure with resilient spokes
Non-volatile memory
Switchable current amplifiers
On-vehicle emergency report apparatus, emergency communication apparatus and emergency report system
Modular base for a cordless portable telephone
Semiconductor device with Si-Ge layer-containing low resistance, tunable contact