Granted Patent
Utility
US 4,634,378 · App. 06/531,445
Dental drill
Inventor:
Henri Leonard
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Sep 12, 1983
Inventor
Henri Leonard
Assignee (at issue)
Micro-Mega
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.