Granted Patent
Utility
US 4,917,390 · App. 07/275,896
Hydraulic seal assembly
Inventors:
John M. Lee, Richard J. Vernon, Robert Janian, David A. Rossi, Stanley E. Charles
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Nov 25, 1988
Inventors
John M. Lee
Richard J. Vernon
Robert Janian
David A. Rossi
Stanley E. Charles
Assignee (at issue)
Tetrafluor, 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.