Apparatus for preventing paraffin deposition

Claim 1

IN COMBINATION, AN ELECTRICALLY CONDUCTIVE WELL TUBING POSITIONED WITHIN A WELL; A CABLE EXTENDING WITHIN SAID TUBING AND SUPPORTING AT ITS LOWER END AN ELECTRICALLY CONDUCTIVE WEIGHTING MEMBER ADAPTED TO BE LOWERED INTO AND WITHDRAWN FROM SAID TUBING, SAID CABLE BEING SUBSTANTIALLY UNIFORMLY ELECTRICALLY RESISTANT THROUGH ITS LENGTH AND BEING MAINTAINED TAUT BY THE ACTION OF GRAVITY ON SAID WEIGHTING MEMBER; AN ELECTRICALLY CONDUCTIVE UPPER SLEEVE RIGIDLY ATTACHED TO SAID WEIGHTING MEMBER; AN ELECTRICALLY CONDUCTIVE LOWER SLEEVE FREE TO SLIDE ALONG SAID WEIGHTING MEMBER; A PLURALITY OF ELECTRICALLY CONDUCTIVE RADIALLY EXTENDING SPRING BOWS DISPOSED RADIALLY AROUND SAID WEIGHTING MEMBER AND ATTACHED AT THEIR UPPER ENDS TO SAID UPPER SLEEVE AND AT THEIR LOWER ENDS TO SAID LOWER SLEEVE, SAID BOWS BEING ADAPTED TO FRICTIONALLY ENGAGE THE INNER WALLS OF TUBING; AND MEANS FOR APPLYING AN ELECTRIC POTENTIAL BETWEEN SAID CABLE AND SAID TUBING.