Granted Patent
Utility
US 6,238,321 · App. 09/419,404
Exercise device
Inventors:
Peter J. Arnold, Philip Lamb, Michael Baum, Mark Sand
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Oct 14, 1999
Inventors
Peter J. Arnold
Philip Lamb
Michael Baum
Mark Sand
Assignee (at issue)
ILLINOIS TOOL WORKS INC.
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.