Granted Patent
Utility
US 5,018,752 · App. 07/511,297
Shaft seal
Inventor:
Larry D. Thomas
Patented Case
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Granted: May 28, 1991
Filed: Apr 19, 1990
Inventor
Larry D. Thomas
Assignee (at issue)
Hoover 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.