Granted Patent
Utility
US 4,248,423 · App. 06/056,934
Tetherball
Inventor:
Hussein M. Lotfy
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Jul 12, 1979
Inventor
Hussein M. Lotfy
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.