Granted Patent
Utility
US 5,311,900 · App. 08/061,566
Leak resistant plug valve
Inventor:
Steven C. Jankowski
Patented Case
View Patent ↗
Granted: May 17, 1994
Filed: May 17, 1993
Inventor
Steven C. Jankowski
Assignee (at issue)
MUELLER COMPANY
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.