Vortex chamber mud pulser
 A vortex chamber fluid pulser selectively produces pressure pulses in fluid flowing therethrough by the alternating insertion and retraction of a flow-disrupting tab into and out of an annular vortex chamber having an inlet and a pair of opposed axial outlets. Insertion of the tab disrupts the normally radial flow of fluid through the chamber and outlets causing the flow to become vortical; retraction of the tab causes a second pressure pulse as the flow returns to radial, sending a sequence of pressure pulses capable of carrying encoded signals to a transducer remotely located in the fluid. 
Defense Research Technologies, Inc.
E G Y Y F
E21B G10K Y10T Y10T F15C
inventional inventional additional additional inventional
Tadeusz M. Frank B. Allen B.
Drzewiecki Vanaman Holmes