Granted Patent
Utility
US 6,047,623 · App. 09/076,920
Hole punch quick-change die assembly with pin strap and positioning system
Inventors:
Marvin E. Whiteman, Jr., Wayne Malmstrom
Patented Case
View Patent ↗
Granted: Apr 11, 2000
Filed: May 12, 1998
Inventors
Marvin E. Whiteman, Jr.
Wayne Malmstrom
Assignee (at issue)
Performance Design, LLC
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.