Granted Patent
Utility
US 5,228,538 · App. 07/835,255
Passenger lift with an electric safety interlock
Inventor:
Jules Tremblay
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Feb 12, 1992
Inventor
Jules Tremblay
Assignee (at issue)
Ricon Corp.
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.