Hi!
Can't give the answer, but probably he donated it indeed to that Airport of Tulsa about 1960? Maybe it has to do with his involment (employment by) of Philips Petroleum Company?
Should read once what's published on bio on Ralph Cooper's website , might be it will reveal more ?
http://earlyaviators.com/eparker.htm
Seems he constructed his own built airplane 1912 , but based indeed on Glenn Curtis model?
VBR
Jempie