Granted Patent
Utility
US 4,802,390 · App. 07/028,188
Auto-grip pliers
Inventor:
William A. Warheit
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Mar 19, 1987
Inventor
William A. Warheit
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.