Granted Patent
Utility
US 5,009,391 · App. 07/611,804
Valve assembly
Inventor:
Carl J. Steigerwald
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Oct 31, 1990
Inventor
Carl J. Steigerwald
Assignee (at issue)
The Kendall Company LP
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.