Granted Patent
Utility
US 5,213,554 · App. 07/724,205
Stepping device
Inventors:
Eric Goldstein, William J. Saunders, Edward Leftwich
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Jul 1, 1991
Inventors
Eric Goldstein
William J. Saunders
Edward Leftwich
Assignee (at issue)
The Step Company
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.