Granted Patent
Utility
US 4,805,757 · App. 07/947,943
Escalator step side plate
Inventor:
John R. Wilcox
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Dec 31, 1986
Inventor
John R. Wilcox
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.