Granted Patent
Utility
US 5,219,304 · App. 07/980,234
Electrical plug
Inventor:
Chen-Hsi Lin
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Nov 23, 1992
Inventor
Chen-Hsi Lin
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.