Granted Patent
Utility
US 4,272,973 · App. 06/033,431
Socket joint for torque wrench
Inventor:
Lee Fu-Tsai
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Apr 26, 1979
Inventor
Lee Fu-Tsai
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.