Granted Patent
Utility
US 5,083,923 · App. 07/532,588
Method of obturating an extirpated root canal
Inventor:
John T. McSpadden
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Jun 4, 1990
Inventor
John T. McSpadden
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.