Granted Patent
Utility
US 6,748,839 · App. 10/003,758
Hole punch quick-change die assembly with positioning system
Inventors:
Marvin E. Whiteman, Jr., Wayne Malmstrom
Patented Case
View Patent ↗
Granted: Jun 15, 2004
Filed: Oct 30, 2001
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.