Granted Patent
Utility
US 4,981,513 · App. 07/048,321
Mixed particulate composition for preparing rare earth-iron-boron sintered magnets
Inventor:
Mohammad H. Ghandehari
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: May 11, 1987
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.