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
Integrated emergency medical database system
Amide derivatives, process for preparation thereof and use thereof as insecticide
Image forming apparatus and system connectable with an authorization apparatus via a communications network, the image forming apparatus comprising an apparatus control section, an initial inq
Apparatus for performing timer management regarding a system timer scheduler service, and associated method
High-efficiency preambles for communications systems over pseudo-stationary communication channels
Method and apparatus for charging a power pack of a portable electronic device
Controller for flexible and extensible flow processing in software-defined networks
  Randomly Featured Patents
D-type flip-flop circiut
Implanting disease resistance to plants with viral replicase DNA molecules which do not have a read-through portion
Substrate holding apparatus for vertically holding a substrate in an exposure apparatus
Game machine having individual difference in same machine kind
Mounting device for components
Automatic dark current compensation
Compact, high-density packaging apparatus for high performance semiconductor devices
Apparatus for adjusting head gap depending upon the thickness of printing paper in ink jet printer
Wipe substrate
Biosynthetic cerebrospinal fluid control