Granted Patent
Utility
US 4,851,058 · App. 06/414,936
High energy product rare earth-iron magnet alloys
Inventor:
John J. Croat
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Sep 3, 1982
Inventor
John J. Croat
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.