Patents Assigned to Geotech Engineering
  • Seismic air gun
    Patent number: 4713800
    Abstract: A seismic air gun has a passage between the stem of its shuttle and a baffle, whereby ambient pressure can reach the back of the operating piston. The gun is fired by dumping a small quantity of pressure air from the operating chamber via a solenoid valve to the ambient surroundings. The firing seal is a lip seal. The shuttle is of unitary construction, while the baffle is diametrically split.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: December 15, 1987
    Assignee: Geotech Engineering
    Inventor: Michael J. Russell