Granted Patent
Utility
US 4,289,321 · App. 06/015,597
Pressure shaft seal and method
Inventor:
Douglas A. Cather, Jr.
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Feb 27, 1979
Inventor
Douglas A. Cather, Jr.
Assignee (at issue)
Garlock, 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.