Granted Patent
Utility
US 4,147,326 · App. 05/870,686
Non-spherical ball valve
Inventor:
Angelo Natalizia
Patented Case
View Patent ↗
Granted: Apr 3, 1979
Filed: Jan 19, 1978
Inventor
Angelo Natalizia
Assignee (at issue)
International Telephone and Telegraph Corporation
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.