Granted Patent
Utility
US 4,258,927 · App. 05/969,162
Shaft seal with retractable polytetrafluoroethylene-lined sealing lip
Inventor:
Douglas A. Cather, Jr.
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Dec 13, 1978
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.