Granted Patent
Utility
US 6,772,860 · App. 10/386,369
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Inventor:
Eugene R. Nelson
Patented Case
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Granted: Aug 10, 2004
Filed: Mar 11, 2003
Inventor
Eugene R. Nelson
Assignee (at issue)
Aluminum Ladder Company
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.