Granted Patent
Utility
US 4,628,809 · App. 06/762,708
Radial orientation rare earth-cobalt magnet rings
Inventors:
Dilip K. Das, Kaplesh Kumar, Ernest C. Wettstein
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: Aug 5, 1985
Inventors
Dilip K. Das
Kaplesh Kumar
Ernest C. Wettstein
Assignee (at issue)
The Charles Stark Draper Laboratory, Inc.
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.