Granted Patent
Utility
US 6,439,093 · App. 09/109,016
Sheet punch device
Inventor:
Michael Davies
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Jul 1, 1998
Inventor
Michael Davies
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.