Magnetic recording tape and method of making same

Claim 1

IN THE MANUFACTURE OF MAGNETIC RECORDING TAPE COMPRISING MAGNETICALLY ORIENTED, MAGNETICALLY ANISOTROPIC FERROMAGNETIC PARTICLES IN A BINDER AND CHARACTERIZED BY SUBSTANTIALLY IDENTICAL RATIO OF OUTPUT TO INPUT AMPLITUDE IN BOTH DIRECTIONS OF TAPE TRAVEL AT ALL FREQUENCIES AND BY A RATIO OF RESIDUAL INDUCTION IN THE DIRECTION OF TAPE TRAVEL TO RESIDUAL INDUCTION IN THE CROSSWISE DIRECTION OF AT LEAST ABOUT 1.3, METBOD COMPRISING APPLYING TO A CARRIER WEB A THIN LAYER OF A COMPOSITION COMPRISING MAGNETICALLY ANISOTROPIC FERROMAGNETIC PARTICLES IN A FLUID BINDER, PASSING THE THUS COATED WEB IN ITS LONGITUDINAL DIRECTION ALONG A PLANE MIDWAY BETWEEN TWO CLOSELY SPACED MAGNETIC POLES OF LIKE POLARITY PROVIDING A CENTRALLY LOCATED FLAT MAGNETIC FIELD EXTENDING LONGITUDINALLY OF SAID WEB CROSS THE ENTIRE COATED WIDTH THEREOF AND OF A STRENGTH SUFFICIENT TO CAUSE ORIENTATION OF SAID PARTICLES, AND THEN SOLIDIFYING SAID BINDER.