Granted Patent
Utility
US 5,647,460 · App. 08/618,249
Spring-type railroad brake shoe locking key
Inventor:
Bruce W. Shute
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Mar 18, 1996
Inventor
Bruce W. Shute
Assignee (at issue)
Westinghouse Air Brake 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.