Granted Patent
Utility
US 4,789,521 · App. 06/876,480
Permanent magnet alloy
Inventors:
Kalathur S. Narasimhan, Bao-Min Ma
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Jun 20, 1986
Inventors
Kalathur S. Narasimhan
Bao-Min Ma
Assignee (at issue)
Crucible Materials Corporation
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.