Granted Patent
Utility
US 6,527,081 · App. 09/870,155
Embankment stairway
Inventors:
Sandy William Tyner, Ronald W. Bennett
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: May 30, 2001
Inventors
Sandy William Tyner
Ronald W. Bennett
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.