Granted Patent
Utility
US 4,711,264 · App. 06/930,195
Plug valve
Inventor:
Richard J. Medvid
Patented Case
View Patent ↗
Granted: Dec 8, 1987
Filed: Nov 13, 1986
Inventor
Richard J. Medvid
Assignee (at issue)
The Duriron Company, 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.