Granted Patent
Utility
US 5,771,768 · App. 08/611,301
Hole punch with quick-change die assembly
Inventor:
Wayne Malmstrom
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Mar 5, 1996
Inventor
Wayne Malmstrom
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.