Granted Patent
Utility
US 4,778,542 · App. 06/885,943
High energy ball milling method for making rare earth-transition metal-boron permanent magnets
Inventor:
Bruce M. Clemens
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Jul 15, 1986
Inventor
Bruce M. Clemens
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.