Method of producing television tube face

Claim 1

THE PROCESS OF PRODUCING A SUBSTANTIALLY NON-REFLECTIVE, GLASS, TELEVISION TUBE, FACE PLATE INCLUDING THE STEPS OF CLEANING AND ETCHING BOTH SURFACES OF SAID PLATE WITH AN INITIAL MILD STRENGTH HYDROFLUORIC ACID BATH, REMOVING SAID GLASS FROM SAID FIRST BATH, INTRODUCING SAID PLATE, WHILE STILL WET FROM SAID FIRST BATH, TO A SUPERSATURATED, HEATED GLASS-ATTACKING SECOND ACIDIC BATH COMPOSED SUBSTANTIALLY OF HYDROFLUORIC ACID CARRIER IN WATER AND DIETHYELENE GYLCOL, REMOVING SAID PLATE FROM SAID SECOND BATH, RENDERING SAID SECOND ACIDIC BATH SOLUTION ON SAID PLATE INACTIVE AND CLEANING SAID GLASS OF ALL RESIDUE, SUBMERGING SAID PLATE IN A THIRD BATH OF HYDROFLUORIC ACID THIS IS MILDER THAN SAID SECOND BATH, BUT STRONGER THAN SAID FIRST BATH, FOR A TIME GREATER THAN THE COMBINED BATH TIMES OF SAID PLATE IN SAID FIRST TWO BATHS, AND REMOVING SAID PLATE FROM SAID THIRD BATH AND RENDERING SAID ACID REMAINING THEREON INACTIVE TO STOP SAID PROCESS.