Granted Patent
Utility
US 4,840,566 · App. 07/056,703
Device for maintaining a boring tool in a vibratory dental instrument
Inventor:
Henri Leonard
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Jun 2, 1987
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.