Granted Patent
Utility
US 4,710,239 · App. 06/897,591
Hot pressed permanent magnet having high and low coercivity regions
Inventors:
Robert W. Lee, Neal A. Schaffel
Patented Case
View Patent ↗
Granted: Dec 1, 1987
Filed: Aug 18, 1986
Inventors
Robert W. Lee
Neal A. Schaffel
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.