Granted Patent
Utility
US 5,429,207 · App. 08/197,745
Rung lock and latch assembly for an extension ladder
Inventors:
William H. Frank, Claude R. Wallick, Jr.
Patented Case
View Patent ↗
Granted: Jul 4, 1995
Filed: Feb 17, 1994
Inventors
William H. Frank
Claude R. Wallick, Jr.
Assignee (at issue)
Emerson Electric Co.
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.