The PDF record shows both parties replied to each other a couple times but the NSA thought his method didn't meet their security criteria.
But they also could have shelved it for years until someone had a use for it, the same as Hedy Lamarr's frequency hopping patent. (Granted, they probably modified it slightly so they didn't have to give him any credit)
But they also could have shelved it for years until someone had a use for it, the same as Hedy Lamarr's frequency hopping patent. (Granted, they probably modified it slightly so they didn't have to give him any credit)