Granted Patent
Utility
US 5,611,243 · App. 08/239,959
Piston advance mechanism for automatic taper
Inventor:
Donald M. MacMillan
Patented Case
View Patent ↗
Granted: Mar 18, 1997
Filed: May 9, 1994
Inventor
Donald M. MacMillan
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.