Granted Patent
Utility
US 5,000,463 · App. 07/419,422
Shaft seal for systems with intermittent operation
Inventor:
Tsu-Hung Sun
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Oct 10, 1989
Inventor
Tsu-Hung Sun
Assignee (at issue)
Hughes Aircraft Company
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.