Granted Patent
Utility
US 6,390,238 · App. 09/636,440
Foldable step stool with leg lock and handle
Inventors:
William R. Gibson, Enrique R. Giner, Maria Antonieta Moreno-Giner
Patented Case
View Patent ↗
Granted: May 21, 2002
Filed: Aug 11, 2000
Inventors
William R. Gibson
Enrique R. Giner
Maria Antonieta Moreno-Giner
Assignee (at issue)
Cosco Management, 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.