Granted Patent
Utility
US 5,149,268 · App. 07/696,753
Method of filling an endodontically prepared root canal
Inventor:
William B. Johnson
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Apr 16, 1991
Inventor
William B. Johnson
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.