Process of making perforated composite oil well bearings

Claim 1

A PROCESS OF MAKING A PERFORATED POWDERED METAL BEARING BUSHING COMPRISING FORMING A CORE FROM WIRE OF METAL AND IS OF A LOWER MELTING TEMPERATURE THAN SAID POWDERED BUSHING METAL BY BENDING SAID WIRE INTO AN APPROXIMATELY HELICAL SHAPE, PLACING SAID CORE IN AN ANNULAR MOLD CAVITY, BENDING THE CONVOLUTIONS OF SAID CORE TO EXTEND REPEATEDLY BACK AND FORTH BETWEEN AND SUBSTANTIALLY TOUCH THE OUTER AND INNER SIDE WALLS OF SAID MOLD CAVITY AND TO SUBSTANTIALLY EXPOSE THE CRESTS OF SAID CONVOLUTIONS AT SAID SIDE WALLS, PLACING A CHARGE OF POWDERED METAL IN SAID MOLD CAVITY AROUND SAID CORE WHILE LEAVING SAID CRESTS OF SAID CONVOLUTIONS SUBSTANTIALLY EXPOSED, COMPRESSING SAID CHARGE IN SAID MOLD CAVITY, AND SINTERING SAID COMPRESSED CHARGE AND CORE CONTAINED THEREIN AT A TEMPERATURE SUFFICIENT TO MELT AND INFILTRATE SAID CORE INTO SAID POWDERED METAL CHARGE WHILE SIMULTANEOUSLY FORMING THEREIN A PASSAGEWAY HAVING THE SHAPE AND LOCATION PREVIOUSLY POSSED BY SAID CORE AND HAVING OPENINGS EXTENDING FROM SAID PASSAGEWAY THROUGH THE SIDE WALLS OF SAID CHARGE AT THE PREVIOUSLY-EXPOSED LOCATIONS OF SAID CORE CONVOLUTIONS.