Granted Patent
Utility
US 6,390,481 · App. 09/523,427
Locking chuck
Inventor:
Daijiro Nakamuro
Patented Case
View Patent ↗
Granted: May 21, 2002
Filed: Mar 10, 2000
Inventor
Daijiro Nakamuro
Assignee (at issue)
Power Tool Holders Incorporated
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.