Method and apparatus for producing permanent magnets

Claim 1

IN THE METHOD OF MANUFACTURING PERMANENT MAGNETS, INCLUDING STEPS OF ADMIXING, CALCINING AND FORMING RAW MATERIAL WHICH UPON FIRING TO A SINTERABLE TEMPERATURE PROVIDES AN OBJECT CAPABLE OF BEING ANISOTROPICALLY MAGNETIZED, AND SINTERING SAID MATERIAL; THE IMPROVEMENT IN COMBINATION THEREWITH: COMPRISING THE STEPS, PRIOR TO SINTERING AND FINALLY MAGNETIZING SAID OBJECT OF FILLING A FLEXIBLE NONMAGNETIC CONTAINER WITH A PULVERIZED, CALCINED, BINDERFREE, PERMANENT MAGNET MATERIAL IN THE DRY STATE,M POSITIONING SAID FILLED CONTAINER WITHIN THE EFFECTIVE LENGTH OF THE COIL OF A MAGNETIZER AND SUBJECTING THE MAGNET MATERIAL TO THE MAGNETIZIN G FORCE OF SAID MAGNETIZER TO ANISOTROPICALLY ORIENT THE PARTICLES OF SAID MATERIAL IN A PRESELECTED DIRECTEION RELATIVE TO THE AXIS OF SAID COIL, SEALING THE FLEXIBLE CONTAINER TO RETAIN THE ANISTROPICALLY ORIENTED MATERIAL AND PLACING THE SAME WITHIN THE CONFINES OF A STATIC TYPE COMPRESSION CHAMBER, SEALING SAID CHAMBER AND INTRODUCING A COMPRESSION MEDIA THEREIN, AND GRADUALLY APPLYING PRESSURE TO THE MEDIA TO COMPRESS THE DRY ORIENTED MAGNET MATERIAL INTO A SELF-SUSTAINING BILLET.