Granted Patent
Utility
US 4,336,944 · App. 06/069,820
Mechanical-dynamic rotary seal
Inventor:
W. Roscoe Blair
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Aug 27, 1979
Inventor
W. Roscoe Blair
Assignee (at issue)
Raybestos-Manhattan, 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.