Granted Patent
Utility
US 4,669,739 · App. 06/911,977
Rotary mechanical fluid face seal with rigid restraint ring means
Inventor:
Constantino Riccitelli
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Sep 26, 1986
Inventor
Constantino Riccitelli
Assignee (at issue)
EG&G Sealol, 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.