Granted Patent
Utility
US 5,370,148 · App. 08/232,506
Butterfly valve assembly and method of manufacture
Inventor:
Terry C. Shafer
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Apr 25, 1994
Inventor
Terry C. Shafer
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.