1
Jeffrey J Stoen, Lynn O Ringdahl: Foldable platform wheelchair lift with safety barrier. Crow River, Palmatier Sjoquist & Helget, March 28, 1995: US05401135 (135 worldwide citation)

A wheelchair lifting platform device for raising or lowering of a wheelchair into or out of a vehicle. The invention includes a barrier safety mechanism which is connected to a wheelchair platform. The barrier safety mechanism includes a barrier plate and an activator flipper plate. The barrier plat ...


2
Lynn O Ringdahl, Jeffrey J Stoen, James B Welte, Gary G Gruber, Timothy W Jenum: Collapsible, powered platform for lifting wheelchair. Crow River, Merchant Gould Smith Edell Welter & Schmidt P A, September 30, 1997: US05672041 (133 worldwide citation)

An apparatus for moving an object, such as a wheelchair, between an upper position and a lower position. The upper position is typically adjacent to the floor surface of a vehicle while the lower position is typically at ground level. The apparatus preferably includes a platform including at least t ...


3
Lynn O Ringdahl, James B Welte: Collapsible, powered platform for lifting wheelchair. Braun Crow River, Woodard Emhardt Naughton Moriarty & McNett, March 19, 2002: US06357992 (13 worldwide citation)

An apparatus for moving an object, such as a wheelchair, between an upper position and a lower position. The upper position is typically adjacent to the floor surface of a vehicle while the lower position is typically at ground level. The apparatus preferably includes a platform including at least t ...


4
Lynn O Ringdahl, James B Welte: Collapsible, powered platform for lifting wheelchair. Crow River, Merchant & Gould P C, April 25, 2000: US06053693 (12 worldwide citation)

An apparatus for moving an object, such as a wheelchair, between an upper position and a lower position. The upper position is typically adjacent to the floor surface of a vehicle while the lower position is typically at ground level. The apparatus preferably includes a platform including at least t ...



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