Granted Patent
Utility
US 4,844,754 · App. 06/840,012
Iron-rare earth-boron permanent magnets by hot working
Inventor:
Robert W. Lee
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Mar 17, 1986
Inventor
Robert W. Lee
Assignee (at issue)
General Motors LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.