Granted Patent
Utility
US 4,304,408 · App. 06/163,832
Sealing ring retention device
Inventor:
Robert G. Greenawalt
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Jun 27, 1980
Inventor
Robert G. Greenawalt
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.