Granted Patent
Utility
US 4,738,418 · App. 06/909,950
Adjustable switch point guard
Inventor:
Arthur W. Farrell
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: Sep 22, 1986
Inventor
Arthur W. Farrell
Assignee (at issue)
ABC Rail Corporation
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.