Granted Patent
Utility
US 4,020,556 · App. 05/217,745
Air driven dental handpiece
Inventor:
Kurt Sotman
Patented Case
View Patent ↗
Granted: May 3, 1977
Filed: Jan 14, 1972
Inventor
Kurt Sotman
Assignee (at issue)
Star Dental Manufacturing Co., Inc.
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.