Originally Posted by
megan
one I found among the thousands was for hydraulic powered controls, first used on the P-38 ailerons. As for infringement, patents do lapse.
Yes they do, but , to be pedantic.on who was fist, it was not the P38, the hydraulic powered flight controls were invented and patented by Rene Leduc in France in 1937 and first used on its first ramjet fighter (Leduc 010)
The patent continued long after the manufacturer stopped its aircraft production in 1958 and it brought steady revenue to the the company for many decades.afrerwards. (
source Rene Leduc biography)