Granted Patent
Utility
US 5,878,635 · App. 08/899,570
Reversible ratchet wrench
Inventor:
Chih-Ching Hsieh
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Jul 24, 1997
Inventor
Chih-Ching Hsieh
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.