US Patent Issued to Keystone Powdered Metal on March 18 for "Powder metal parts with improved machinability" (Pennsylvania Inventor)

ALEXANDRIA, Va., March 19 -- United States Patent no. 12,251,759, issued on March 18, was assigned to Keystone Powdered Metal Co. (St. Marys, Pa.).

"Powder metal parts with improved machinability" was invented by Peter G. Imbrogno (Dubois, Pa.).

According to the abstract* released by the U.S. Patent & Trademark Office: "It has been unexpected found that the machinability and corrosion resistance of powder metal parts can be greatly improved by incorporating calcium aluminoferrite powder, such as naturally occurring brownmillerite powder (Ca2(Al,Fe)2O5), into the part. Improved machinability is of enormous value in manufacturing countless parts where it is necessary or desirable to machine the part after it has been sintered, such as is fr...