Granted Patent
Utility
US 5,253,843 · App. 07/990,331
Retractable-gasket valve having two stiffnesses
Inventor:
Patrick Garceau
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Dec 10, 1992
Inventor
Patrick Garceau
Assignee (at issue)
Societe Europenne de Propulsion
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.