Granted Patent
Utility
US 4,990,090 · App. 07/562,416
Endodontic post construction
Inventor:
James B. Roane
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jul 30, 1990
Inventor
James B. Roane
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.