发明授权
US3654163A Cobalt ferrite magnetic powder for tape recording 失效
钴铁粉磁铁用于磁带录音

Cobalt ferrite magnetic powder for tape recording
摘要:
IMPROVED COBALT FERRITE MAGNETIC POWDERS SUITABLE FOR APPLICATION TO MAGNEIC RECORDING TECHNIQUES AND CONTAINING CONTROLLED AMOUNTS OF ZINC, MAGNESIUM, CADMIUM, OR CALCIUM, OR MIXTURES OF TWO OR MORE OF THESE METALS TO IMPROVE THE STORAGE CHARACTERISICS OF THE TAPE.
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