Granted Patent
Utility
US 6,073,523 · App. 09/257,493
Screw-driving apparatus
Inventor:
Katsumi Shinjo
Patented Case
View Patent ↗
Granted: Jun 13, 2000
Filed: Feb 25, 1999
Inventor
Katsumi Shinjo
Assignee (at issue)
Yugenkaisha Shinjo Seisakusho
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.