Granted Patent
Utility
US 5,015,306 · App. 07/428,857
Method for preparing rare earth-iron-boron sintered magnets
Inventor:
Mohammad H. Ghandehari
Patented Case
View Patent ↗
Granted: May 14, 1991
Filed: Oct 30, 1989
Inventor
Mohammad H. Ghandehari
Assignee (at issue)
Union Oil Company of California
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.