Around 11 years ago a man put a patent of a pair of stilts with a spring on them.
What is claimed is:
1. Device for facilitating the locomotion of a person comprising:
a spring system removably attachable to a leg of the person, the spring
system including at least one spring element, the spring system enabling
the person, by compression and deflection of the at least one spring
element, to walk on a ground surface by jumping step-by-step,
said at
least one spring element comprising a leaf spring having an arc-shaped
configurationBut back in
August 1954 Professional acrobats Bill Gaffney and Tom Weaver demonstrate their pogo stilt invention.



Now read the claim again but miss out the green bit !
Spring loaded stilts first made in 1954. Unless you can know different ?