The problem is that the actual result is always NULL
These guys got out 90 minutes of increased autonomy on their helicopter by using the system created by Pantone. They had to remove it not because it didn't work, but because it infringed aeronautic authority regulations.
I wouldn't call it "a null result".
Or, if you still consider it a null result, you can see plenty of more "null results" in the site where this is linked.