Cathode ray tube and method of operation

Claim 1

A CATHODE RAY TUBE COMPRISING AN ENVELOPE INCLUDING A GENERALLY RECTANGULAR FACEPLATE, A NECK, AND AN INTERCONNECTING FUNNEL, A GENERALLY RECTANGULAR PHOSPHOR SCREEN ON SAID FACEPLATE, AN ELECTRON GUN IN SAID NECK FOR PROJECTING AN ELECTRON BEAM UPON SAID SCREEN, A MESH ELECTRODE MOUNTED ACROSS SAID ENVELOPE IN SAID BEAM PATH ADJACENT TO THE NECK END OF SAID FUNNEL, A FIRST CONDUCTIVE COATING ON SAID ENVELOPE EXTENDING FROM SAID MESH TOWARD SAID GUN, A SECOND CONDUCTIVE COATING ON SAID ENVELOPE BETWEEN AND SPACED FROM BOTH SAID SCREEN AND SAID MESH, A THIRD CONDUCTIVE COATING ON SAID SCREEN, A HIGH RESISTANCE COATING ON SAID ENVELOPE SEPARATING SAID FIRST AND SECOND CONDUCTIVE COATINGS AND HAVING A SHAPE COMPRISING FOUR LOBES EXTENDING GENERALLY TOWARD THE FOUR CORNERS OF SAID RECTANGULAR SCREEN, AND SEPARATE EXTERNAL TERMINAL MEANS CONNECTED TO EACH OF SAID CONDUCTIVE COATINGS FOR SUPPLYING DIFFERENT ELECTRICAL POTENTIALS THERETO.