Granted Patent
Utility
US 5,503,562 · App. 08/386,424
Endodontic inspection block
Inventor:
Ralph C. Mays
Patented Case
View Patent ↗
Granted: Apr 2, 1996
Filed: Feb 10, 1995
Inventor
Ralph C. Mays
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.