Granted Patent
Utility
US 4,959,107 · App. 07/331,822
Method and apparatus for treating ladder rungs for forming assembly with ladder rails
Inventors:
Claude R. Wallick, Jr., Thomas J. Schmitt, Bruce E. Bogart, John L. Krebs
Patented Case
View Patent ↗
Granted: Sep 25, 1990
Filed: Apr 3, 1989
Inventors
Claude R. Wallick, Jr.
Thomas J. Schmitt
Bruce E. Bogart
John L. Krebs
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.