Granted Patent
Utility
US 5,205,536 · App. 07/950,796
Top entry, trunnion-type ball valve
Inventor:
Edward J. Holec
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Sep 24, 1992
Inventor
Edward J. Holec
Assignee (at issue)
Newport News Shipbuilding and Dry Dock 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.