Granted Patent
Utility
US 6,309,170 · App. 09/375,714
Vehicle wheelchair lift with mutually perpendicular pivot axes and parallelogram transport
Inventor:
Roger Vartanian
Patented Case
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Granted: Oct 30, 2001
Filed: Aug 17, 1999
Inventor
Roger Vartanian
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.