Granted Patent
Utility
US 5,938,440 · App. 08/844,142
Endodontic instrument
Inventor:
John T. McSpadden
Patented Case
View Patent ↗
Granted: Aug 17, 1999
Filed: Apr 18, 1997
Inventor
John T. McSpadden
Assignee (at issue)
Ormco Corporation
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.