1. M.A. Quillan, C.M. Folks, Invalid walker and seat, Dec. 04, 1990.
2. E.P. Rose, Foldable rolling walker, Mar. 13, 1990.
3. T. Uchiyama, Foldable walking-assistant device, Aug. 08, 2000.
4. E. Razon, Adjustable leg support and seated to stand up walker, May 11, 2004.
5. L. Mullholand, Assistive walking device, Oct. 02, 2007.