Granted Patent
Utility
US 5,636,988 · App. 08/334,586
Sonic dental device
Inventor:
Ronald K. Murayama
Patented Case
View Patent ↗
Granted: Jun 10, 1997
Filed: Nov 4, 1994
Inventor
Ronald K. Murayama
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.