Granted Patent
Utility
US 5,678,409 · App. 08/667,558
Passive three state electromagnetic motor/damper for controlling stirling refrigerator expanders
Inventor:
Kenneth D. Price
Patented Case
View Patent ↗
Granted: Oct 21, 1997
Filed: Jun 21, 1996
Inventor
Kenneth D. Price
Assignee (at issue)
HUGHES ELECTRONICS LIMITED
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.