Granted Patent
Utility
US 5,957,237 · App. 08/987,563
Motorized collapsible step
Inventor:
Robert Tigner
Patented Case
View Patent ↗
Granted: Sep 28, 1999
Filed: Dec 11, 1997
Inventor
Robert Tigner
Assignee (at issue)
Specific Cruise Systems, Inc.
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.